• 不安ふあん — anxiety, unease
• 不便ふべん — inconvenience
• 不満ふまん — dissatisfaction
• 不可能ふかのう — impossible
• 不思議ふしぎ — mysterious, strange

Derived from a shape originally related to plants or buds, 不 came to represent negation or contradiction. It’s one of the most frequently used prefixes to reverse or negate the meaning of a word in both classical and modern Japanese.

将来しょうらいに不安ふあんを感かんじます。
I feel uneasy about the future.

不便ふべんな場所ばしょに住すんでいます。
I live in an inconvenient location.

それは 不可能ふかのうです。
That’s impossible.

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