不 定 期(ふていき)

ふていき

na-adjective, noun

irregular, at random intervals

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)ながら季刊(きかん)誌(し)を発行(はっこう)していたが、最近(さいきん)は休刊(きゅうかん)している。

They had been publishing a quarterly magazine at irregular intervals, but it has been on hiatus recently.

Usage: 不定期(ふていき) modifies nouns with な or に to form an adverb.

Common collocations

不定期(ふていき)に更新(こうしん)する (to update irregularly)
不定期(ふていき)運行(うんこう) (irregular service)
不定期(ふていき)連載(れんさい) (irregularly serialized)
不定期(ふていき)開催(かいさい) (held at irregular intervals)

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 2026.9.2 13:01

11000/11390_futeiki