Definition

1. Adjective:
   • Not planned or arranged in advance; not included on a timetable or agenda: Describes an event, activity, or stop that occurs without prior planning or outside of a fixed schedule.

Usage

• The adjective unscheduled is used to modify nouns, indicating their spontaneous or unplanned nature. It is the opposite of "scheduled."
• It is commonly used in formal and informal contexts related to travel, meetings, maintenance, and events.

Examples

• Adjective:
  • The CEO called an unscheduled meeting to address the urgent crisis.
  • Due to a medical emergency, the flight made an unscheduled landing in Denver.
  • The power plant will undergo unscheduled maintenance tonight, which may cause outages.

Advanced Usage

• "to be unscheduled": to not be on the official plan or roster.
  • The senator's visit to the base was completely unscheduled.
• Used in contrast with "scheduled" to emphasize deviation from a plan.
  • While two scheduled trains were canceled, three unscheduled extra trains were added to manage the crowd.

Variants and Related Words

• Unplanned (adj): Not planned. (Similar in meaning but can imply a lack of any intention, whereas "unscheduled" often implies an absence from a formal timetable.)
• Impromptu (adj): Done without being planned or rehearsed. (Often used for speeches or performances, emphasizing spontaneity.)
• Ad hoc (adj): Created or done for a particular purpose as necessary. (Often used for committees or meetings, implying improvisation to address a specific issue.)

Synonyms

• Unplanned
• Impromptu
• Spontaneous
• Extemporaneous

Antonyms

• Scheduled
• Planned
• Arranged
• Timetabled

Related Phrases

• Unscheduled stop: A stop not listed on the official itinerary, common in travel contexts.
  • The bus driver made an unscheduled stop to allow a passenger to feel better.
• Unscheduled absence: An absence from work or school that was not requested or approved in advance.
  • Her unscheduled absence was due to a sudden family emergency.
• Unscheduled downtime: Periods when a system, machine, or service is not operational due to an unplanned failure.
  • The website experienced six hours of unscheduled downtime after the server crash.

Adjective

1. not scheduled or not on a regular schedule
   • an unscheduled meeting
   • the plane made an unscheduled stop at Gander for refueling