不意 (fui) conjugation
sudden, abrupt, unexpected
不意 (ふい, fui) is a na-adjective. Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 不意だ fuida | 不意です fuidesu | The form you look up. Also the casual “is ~”. |
| Negative | 不意じゃない fuijanai | 不意じゃないです fuijanaidesu | “is not ~”. |
| Past | 不意だった fuidatta | 不意でした fuideshita | “was ~”. |
| Past negative | 不意じゃなかった fuijanakatta | 不意じゃなかったです fuijanakattadesu | “was not ~”. |
| Te-form | 不意で fuide | — | Links to the next clause: “~ and …”. |
| Adverb | 不意に fuini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 不意な〜 fuina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 不意なら fuinara | — | “if it is ~”. |
| Conditional (~たら) | 不意だったら fuidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 不意になる fuininaru | 不意になります fuininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 不意すぎる fuisugiru | 不意すぎます fuisugimasu | “too ~”. |
| Looks ~ (~そう) | 不意そう fuisou | 不意そうです fuisoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
See the full rules in the adjective conjugation guide.