不

Meaning

Not, un- · no, in-

Readings

• On (音読み): フ・ブ
• Kun (訓読み): —

Example words

• 不便（ふべん）— inconvenient
• 不安（ふあん）— anxious
• 不足（ふそく）— shortage

Structure

Radical 一 (いち · One) · 4 strokes · school grade 4

Watch out

Prefix only, like Spanish in-/des-. Compare 無 (無料, 無理) — also a negative prefix, chosen by word, not by rule.