無邪気 (mujaki) conjugation
innocence, simple-mindedness
無邪気 (むじゃき, mujaki) 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 | 無邪気だ mujakida | 無邪気です mujakidesu | The form you look up. Also the casual “is ~”. |
| Negative | 無邪気じゃない mujakijanai | 無邪気じゃないです mujakijanaidesu | “is not ~”. |
| Past | 無邪気だった mujakidatta | 無邪気でした mujakideshita | “was ~”. |
| Past negative | 無邪気じゃなかった mujakijanakatta | 無邪気じゃなかったです mujakijanakattadesu | “was not ~”. |
| Te-form | 無邪気で mujakide | — | Links to the next clause: “~ and …”. |
| Adverb | 無邪気に mujakini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 無邪気な〜 mujakina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 無邪気なら mujakinara | — | “if it is ~”. |
| Conditional (~たら) | 無邪気だったら mujakidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 無邪気になる mujakininaru | 無邪気になります mujakininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 無邪気すぎる mujakisugiru | 無邪気すぎます mujakisugimasu | “too ~”. |
| Looks ~ (~そう) | 無邪気そう mujakisou | 無邪気そうです mujakisoudesu | “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.