不定期(ふていき)

ふていき
na-adjective, noun
irregular, at random intervals
time-general
1. irregular, at random intervals, unscheduled
Describes something that does not follow a fixed or regular schedule. Used for events, publications, services, and other activities that occur at unpredictable or varying intervals.
不定期(ふていき)に更新(こうしん)しています。
I update at irregular intervals.
このバスは不定期(ふていき)運行(うんこう)なので、時刻表(じこくひょう)がない。
This bus runs on an irregular schedule, so there is no timetable.
不定期(ふていき)ではあるが、会員(かいいん)向(む)けにニュースレターを発行(はっこう)している。
We publish a newsletter for members, though not on a regular schedule.

Usage: Takes な before a noun (不定期(ふていき)な休(やす)み) and に as an adverb (不定期(ふていき)に更新(こうしん)する), and also attaches directly to nouns (不定期便(ふていきびん)).

Common collocations

Pair: The opposite is 定期(ていき) (regular, periodic). For example: 定期(ていき)便(びん) (regular service/flight) vs. 不定期(ふていき)便(びん) (charter/irregular service).

Related Words

Antonym: 定期(ていき) (fixed term)
general
Added 2026.2.16 11:03 · Revised 2026.10.19 23:12
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