mad
mad — adjective
1. a label from earlier times for someone whose thinking or behaviour was severely
a label from earlier times for someone whose thinking or behaviour was severely disturbed by a health problem; in modern use, applying this word to a real person with a mental health condition is considered deeply disrespectful.
The old hospital file described the patient as 'mad,' a label that doctors would never use today.
historical context: describes outdated medical usage
In the 1800s, women who refused to obey their husbands were sometimes called mad and sent away to asylums.
Calling a person with depression 'mad' is deeply offensive and shows a lack of understanding about mental health.
The school ran a workshop on why words like mad should not be used to describe mental health conditions.
- mentally ill
the neutral, modern term; preferred in clinical and polite contexts
- insane
stronger and also potentially offensive; used more in legal contexts (insanity defense) than in everyday speech
- deranged
literary or dramatic; suggests extreme disturbance
文法句型
mad + noun
be + mad
用法筆記
This sense is now considered offensive when used about a real person. Use 'has a mental health condition,' 'is mentally ill,' or name the specific condition (e.g. 'has schizophrenia') instead. The word remains acceptable in fixed historical or metaphorical contexts (e.g. 'mad as a hatter' in literature).
常見錯誤
2. so unreasonable or lacking in good sense that other people cannot understand you
so unreasonable or lacking in good sense that other people cannot understand your thinking or actions.
You would be mad to walk home alone through that park at three in the morning.
be + mad + to-infinitive for describing unwise actions
Caio thought it was a mad idea to quit his job without any savings in the bank.
The whole team is going skydiving next weekend, which sounds absolutely mad to me.
It is completely mad to pay five thousand dollars for a bicycle, no matter how good it is.
Leo told his sister she was mad to lend money to someone she had only met twice.
- crazy
very similar in meaning and register; 'crazy' is slightly more common in American English for this sense
- stupid
stronger and more direct; less playful than 'mad'
- absurd
more formal; emphasises the lack of logic in the situation
- ridiculous
suggests something is laughably unreasonable
- sensible
showing good judgment and reason
- reasonable
based on good sense and logic
文法句型
be + mad + to-infinitive
be + mad + that-clause
it + be + mad + to-infinitive
用法筆記
Common in both British and American English, but in British English this 'foolish' sense is more frequent than the 'angry' sense. Often used in exclamations: 'Are you mad?!'
常見錯誤
3. feeling strong displeasure or irritation toward someone or because of something
feeling strong displeasure or irritation toward someone or because of something that happened.
Roya was mad at her brother for borrowing her laptop without asking permission first.
mad + at + person for + reason
The customers got mad when the store ran out of the discounted items before midday.
Are you still mad about what happened at the dinner party last Saturday night?
The coach was so mad after the loss that he made the whole team run extra laps around the field.
It makes me mad when people throw rubbish on the beach instead of using the bins provided.
文法句型
mad + at + person/thing
mad + about + situation
get + mad
make + someone + mad
用法筆記
Predominantly American English. In British English, 'mad' more often means 'foolish' (sense 2); to express anger, British speakers typically use 'angry', 'cross', or 'furious'. 'Mad at' is the standard preposition pattern in American English; 'mad about' is also common for situations.
常見錯誤
4. full of fast, uncontrolled activity or excitement, often because there is too mu
full of fast, uncontrolled activity or excitement, often because there is too much to do or too many people in one place.
There was a mad rush to finish the report before the five o'clock deadline on Friday.
collocation: mad rush
Amihan made a mad dash through the airport to catch her connecting flight to Manila.
The shopping centre was absolutely mad with crowds on the last Saturday before Christmas.
The office turned into a mad scene when the fire alarm went off during the quarterly presentation.
Small children ran around in a mad frenzy at the birthday party after eating too much cake.
文法句型
mad + noun (rush, dash, scramble)
mad + with + noun (crowds, excitement)
用法筆記
Often used as an intensifier before nouns describing activity: 'mad rush', 'mad dash', 'mad scramble', 'mad panic'. The focus is on frenetic chaos rather than simple speed.
5. feeling extremely strong liking or enthusiasm for a particular activity, interes
feeling extremely strong liking or enthusiasm for a particular activity, interest, or person to the point where it occupies much of your thoughts and time.
Eri is absolutely mad about Japanese animation and watches at least one film every evening.
mad + about + noun phrase
Little Nila is mad about horses and spends every single weekend at the riding stable near her home.
Christopher is mad about vintage cars and owns three old Ford models from the nineteen sixties.
Adisa has been mad about football since he was five years old and can name every player in the league.
Jiwoo is mad about Korean baking shows and tries every new recipe she watches.
- crazy about
identical in meaning and register; very common in informal speech
- wild about
similar intensity but less common in modern usage
- keen on
chiefly British; milder than 'mad about'; covers general interest
- into
very informal; 'He is really into photography'
文法句型
mad + about + noun/gerund
mad + on + noun/gerund (British)
mad + for + noun
用法筆記
Followed by 'about' (most common in all varieties) or 'on' (chiefly British). The structure is 'be mad about + noun/gerund'. This sense is always about something you already engage with and enjoy, not about something you want but lack (see sense 6).
常見錯誤
6. feeling an intense longing or craving for someone or something that you do not c
feeling an intense longing or craving for someone or something that you do not currently have, to the point that it fills your thoughts.
Inès was mad for a chance to study art in Paris and applied to three different schools there.
mad + for + noun expressing strong desire
The team is mad for a championship win this season after losing every single match last year.
Teenagers in the nineteen sixties were mad for tickets to see the Beatles and would queue all night long.
Élise was mad to get the new video game console and checked the store website every morning.
- dying for
stronger and more emotional; 'I am dying for a cup of tea'
- desperate for
suggests urgency and need; slightly more formal
- craving
usually for food, drink, or specific experiences
文法句型
mad + for + noun
mad + to + verb
用法筆記
Distinguish from sense 5 (MAD ABOUT): sense 5 describes enjoyment of something you already have; sense 6 describes a yearning for something you lack. 'Mad for' typically signals this craving sense, while 'mad about' signals enthusiasm.
7. so completely focused on getting or keeping something—especially power, money, o
so completely focused on getting or keeping something—especially power, money, or status—that normal limits of right and wrong no longer guide your behaviour.
The dictator had become power-mad and refused to listen to any of his advisors or generals.
compound: power-mad
Darius was so money-mad that he cheated his own business partner out of half a million dollars.
A power-mad manager can destroy team morale very quickly by ignoring everyone else's input.
The media described the politician as ambition-mad after she campaigned eighteen hours a day for months.
- obsessed
strong; can be neutral or negative depending on context
- consumed by
suggests the obsession has taken over someone's entire being
- addicted to
suggests a compulsive, habit-forming attachment
文法句型
power-mad
money-mad
sex-mad
ambition-mad
greed-mad
用法筆記
Almost always used in compounds (power-mad, money-mad, sex-mad, ambition-mad). The compound form carries a strong negative judgment, suggesting the person has lost moral perspective. This is stronger and more critical than sense 5 (enthusiasm) or sense 6 (desire).
常見錯誤
8. used before nouns to emphasise that something happens in great amount, at very h
used before nouns to emphasise that something happens in great amount, at very high speed, or with a lot of force or energy.
There was a mad scramble for tickets when the popular band announced their world tour dates.
collocation: mad scramble
The team put in a mad effort to turn the game around in the final ten minutes of play.
We had a mad amount of paperwork to finish before the auditors arrived from head office.
My grandmother was working at a mad pace in the kitchen, preparing food for thirty dinner guests.
文法句型
mad + noun (effort, amount, dash)
adjective + mad (stone mad, stark mad)
用法筆記
Unlike other senses, this sense modifies nouns rather than describing people's feelings. Typical nouns: rush, dash, scramble, panic, pace, effort, amount. British English also uses 'stark staring mad' and 'stone mad' as fixed intensifying phrases.
9. used after a noun to describe someone who is extremely and enthusiastically inte
used after a noun to describe someone who is extremely and enthusiastically interested in that thing, often spending a lot of time or money on it.
Rohan is completely football-mad and watches every single match his favourite team plays.
suffix: football-mad
My younger brother is train-mad and can name every locomotive model that has ever been built.
Yael is clothes-mad and spends most of her part-time salary on new outfits every single month.
Japan is famous for having gadget-mad consumers who love to buy the latest electronic devices.
文法句型
[noun] + mad (e.g. football-mad, car-mad, clothes-mad)
用法筆記
This functions as a suffix attached to nouns. Common in British and Australian English; less frequent in American English. The resulting compound adjective describes a hobby-level or lifestyle-level enthusiasm rather than the morally negative obsession of sense 7 (power-mad).
mad — adverb
1. used before an adjective to add strong emphasis; the same as saying 'very' or 'e
used before an adjective to add strong emphasis; the same as saying 'very' or 'extremely.'
The street party last night was mad fun and everyone danced until the early hours of the morning.
mad + adjective (fun) expressing emphasis
That roller coaster was mad scary but Noa loved every second and went on it twice more.
The young guitarist is mad talented even though he has only been playing for two years.
The queue for the new ice cream shop was mad long, so we decided to come back another day.
文法句型
mad + adjective
用法筆記
Chiefly used in informal British English. It is not standard in formal writing and is most common among younger speakers in spoken conversation and social media. Do not use this sense in academic or professional writing.
mad — noun
1. a military and political theory stating that if two opposing countries each have
a military and political theory stating that if two opposing countries each have enough nuclear weapons to destroy the other completely, neither side will start a war because doing so would mean its own destruction as well.
The Cold War policy of MAD meant neither side could attack without facing total destruction.
historical context: Cold War policy of MAD
During the nineteen sixties, MAD became the central idea behind nuclear strategy between the two superpowers.
Critics of MAD argue the theory only works when both sides behave in a fully rational way.
The letters M-A-D stand for 'mutual assured destruction,' a concept that shaped global politics for decades.
文法句型
MAD (uncountable noun; used as a proper noun)
用法筆記
Always written in capital letters as 'MAD' when standing for the acronym. As a countable noun ('a MAD policy') it is rare. The full form 'mutually assured destruction' is spelled with either 'mutual' or 'mutually' depending on the source.
mad — verb
1. to make a person or animal very angry, irritated, or unable to think clearly, us
to make a person or animal very angry, irritated, or unable to think clearly, usually through repeated annoyance or frustration.
The constant noise from the construction site next door was starting to madden the elderly residents of the building.
transitive: madden + object (people)
It maddens me when people talk loudly on their phones during a film at the cinema.
it maddens + object + when-clause
The slow internet connection maddens everyone in the office, especially on busy days with deadlines.
Her constant complaining about small things would madden even the most patient person in the world.
- madden
the modern form of the same verb; more common than 'mad' as a verb
- infuriate
slightly stronger; suggests making someone extremely angry
- enrage
stronger still; suggests pushing someone into a state of rage
- drive crazy
informal phrasal equivalent; far more common in speech
文法句型
madden + object
it maddens + object + when/that-clause
用法筆記
This verb is rare in modern everyday speech; the noun 'maddening' (adjective) is somewhat more common ('a maddening delay'). In most contexts, speakers prefer 'drive someone crazy,' 'make someone furious,' or 'annoy.' The verb is most often found in literary writing.