不 十 分(ふじゅうぶん)

ふじゅうぶん

na-adjective

insufficient; inadequate

1. insufficient; inadequate; not enough

Not meeting the required or expected amount, quality, or standard.

説明(せつめい)が不十分(ふじゅうぶん)だった。

The explanation was insufficient.

準備(じゅんび)が不十分(ふじゅうぶん)だと感(かん)じる。

I feel that the preparation is inadequate.

睡眠(すいみん)が不十分(ふじゅうぶん)だと体(からだ)に悪(わる)い。

Insufficient sleep is bad for your health.

不十分(ふじゅうぶん) is a na-adjective meaning insufficient or inadequate, formed from 不(ふ) (not) + 十分(じゅうぶん) (sufficient).

Forms

不(ふ) (negative prefix) + 十分(じゅうぶん) (enough) → 'not enough'

Na-adjective: 不十分(ふじゅうぶん)な + noun
Predicate: 不十分(ふじゅうぶん)だ/です

Common collocations

不十分(ふじゅうぶん)な説明(せつめい): insufficient explanation
不十分(ふじゅうぶん)な対応(たいおう): inadequate response
不十分(ふじゅうぶん)な準備(じゅんび): inadequate preparation
不十分(ふじゅうぶん)な理解(りかい): insufficient understanding

Similar words

十分(じゅうぶん): sufficient, enough

不足(ふそく): shortage, lack
足(た)りない: not enough (more colloquial)

Related Words

Antonym: 十分(じゅうぶん) (sufficient)

Synonym: 不足(ふそく) (shortage, lack)

Compare: 足(た)りる (not enough)

Compare: 過小(かしょう)な (too small)

Compare: 不徹底(ふてってい) (incomplete)

Compare: 準備不足(じゅんびぶそく) (lack of preparation)

Related: 不熱心(ふねっしん) (unenthusiastic)

general

Added 2026.1.16 17:20 · Revised 2026.10.20 9:21

05500/05616_fujuubun