不思議 (fushigi) conjugation
mystery, curiosity
不思議 (ふしぎ, fushigi) 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 | 不思議だ fushigida | 不思議です fushigidesu | The form you look up. Also the casual “is ~”. |
| Negative | 不思議じゃない fushigijanai | 不思議じゃないです fushigijanaidesu | “is not ~”. |
| Past | 不思議だった fushigidatta | 不思議でした fushigideshita | “was ~”. |
| Past negative | 不思議じゃなかった fushigijanakatta | 不思議じゃなかったです fushigijanakattadesu | “was not ~”. |
| Te-form | 不思議で fushigide | — | Links to the next clause: “~ and …”. |
| Adverb | 不思議に fushigini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 不思議な〜 fushigina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 不思議なら fushiginara | — | “if it is ~”. |
| Conditional (~たら) | 不思議だったら fushigidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 不思議になる fushigininaru | 不思議になります fushigininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 不思議すぎる fushigisugiru | 不思議すぎます fushigisugimasu | “too ~”. |
| Looks ~ (~そう) | 不思議そう fushigisou | 不思議そうです fushigisoudesu | “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.