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).

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

FORMS:

  • 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

OPPOSITE:
十分(じゅうぶん): sufficient, enough

SIMILAR WORDS:

  • 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)
general
Added 2026.1.16 17:20 · Revised 2026.1.27 8:53
05500/05616_fujuubun