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不
“not / un-” in Japanese is 不, read fu, bu (ふ, ぶ). It is a Grade 4 Kyōiku kanji, taught in year 4 of Japanese elementary school, and appears in words such as 不安 (anxiety / unease).
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What does 不 mean?
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天気が不安定だ。
てんきがふあんていだ。The weather is unstable.
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Updated: 2026-08-28