unscheduled

unscheduled — adjective

1. happening or done without having been added to a plan or calendar in advance — f

1.形容詞B1
釋義

happening or done without having been added to a plan or calendar in advance — for example, when a train makes an unscheduled stop or a team holds an unscheduled practice session.

例句

The bus made an unscheduled stop near the park to let Diya off.

collocation: make an unscheduled stop

An unscheduled power cut left the Watanabe family without electricity during dinner.

collocation: unscheduled power cut

同義詞
  • unplanned

    the closest synonym; slightly broader in scope, also used for things that simply lack a plan

  • impromptu

    suggests something done on the spur of the moment, often creative or social, with no preparation at all

  • ad hoc

    more formal; used for arrangements created for a specific purpose, often in professional contexts

  • spontaneous

    emphasises a natural impulse or desire rather than an omission from a timetable

反義詞
  • scheduled

    the exact opposite; planned and set for a fixed time

  • planned

    arranged in advance; broader than scheduled

  • prearranged

    agreed upon before the event

文法句型

unscheduled + noun

用法筆記

Almost always used before a noun (attributive position). The opposite is scheduled. Since unscheduled describes a binary state — either something was on a plan or it was not — it is rarely used with degree adverbs like 'very' or 'quite.'

常見錯誤

❌I made an unscheduled appointment with my dentist.
✅I made a last-minute appointment with my dentist.
💡Unscheduled describes something that happens without being on a plan at all, not something you deliberately arranged at short notice.
❌The heavy rain was completely unscheduled.
✅The heavy rain was completely unexpected.
💡Rain cannot be put on a calendar, so 'unscheduled' does not apply. Use 'unexpected' for surprising natural events.