清純 (seijun) conjugation
purity, innocence
清純 (せいじゅん, seijun) 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 | 清純だ seijunda | 清純です seijundesu | The form you look up. Also the casual “is ~”. |
| Negative | 清純じゃない seijunjanai | 清純じゃないです seijunjanaidesu | “is not ~”. |
| Past | 清純だった seijundatta | 清純でした seijundeshita | “was ~”. |
| Past negative | 清純じゃなかった seijunjanakatta | 清純じゃなかったです seijunjanakattadesu | “was not ~”. |
| Te-form | 清純で seijunde | — | Links to the next clause: “~ and …”. |
| Adverb | 清純に seijunni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 清純な〜 seijunna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 清純なら seijunnara | — | “if it is ~”. |
| Conditional (~たら) | 清純だったら seijundattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 清純になる seijunninaru | 清純になります seijunninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 清純すぎる seijunsugiru | 清純すぎます seijunsugimasu | “too ~”. |
| Looks ~ (~そう) | 清純そう seijunsou | 清純そうです seijunsoudesu | “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.