不ふ十じゅう分ぶん

ふ

じゅ

う

ぶ

ん

Common wordJLPTN1Freq.FrequencyTop 10,000

Meanings

Describes a state where quantity, quality, or degree falls short of what is needed or expected. Used for resources, preparation, explanation, etc.

Related words· 6

不ふ足そくN3
不足 is a noun/suru-verb for a concrete shortage or lack (e.g. 睡眠不足), while 不十分 is an adjectival noun describing an insufficient quality or degree.
不ふ完かん全ぜんN3
不完全 emphasizes something being incomplete or flawed in its parts, whereas 不十分 emphasizes an amount or extent falling short.
不ふ備びN1
不備 refers to a concrete defect or missing item (often in documents or equipment), while 不十分 more broadly describes insufficient degree or quality.
不ふ全ぜん
不十分 is the plain, everyday word for 'not enough', while 不全 is a more formal Sino-Japanese term that often implies incomplete function, not just insufficient quantity.

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今いまひとつN2
不十分 is a direct, formal adjective meaning 'insufficient', whereas 今ひとつ softens the criticism and sounds more like a mild complaint.
不ふ適てき当とうN2
不十分 describes insufficiency in quantity or degree, whereas 不適当 describes a qualitative mismatch with the requirements.

Opposites

十じゅう分ぶんN4
十分 means sufficient or adequate, while 不十分 means the opposite—insufficient or inadequate.
完かん全ぜんN3
不十分 means insufficient or lacking, the opposite of the wholeness expressed by 完全.
十じゅう二に分ぶん
不十分 means 'insufficient' or 'inadequate', the direct opposite of the abundant sufficiency expressed by 十二分.