純粋 (junsui) conjugation
pure, genuine, unmixed
純粋 (じゅんすい, junsui) 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 | 純粋だ junsuida | 純粋です junsuidesu | The form you look up. Also the casual “is ~”. |
| Negative | 純粋じゃない junsuijanai | 純粋じゃないです junsuijanaidesu | “is not ~”. |
| Past | 純粋だった junsuidatta | 純粋でした junsuideshita | “was ~”. |
| Past negative | 純粋じゃなかった junsuijanakatta | 純粋じゃなかったです junsuijanakattadesu | “was not ~”. |
| Te-form | 純粋で junsuide | — | Links to the next clause: “~ and …”. |
| Adverb | 純粋に junsuini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 純粋な〜 junsuina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 純粋なら junsuinara | — | “if it is ~”. |
| Conditional (~たら) | 純粋だったら junsuidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 純粋になる junsuininaru | 純粋になります junsuininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 純粋すぎる junsuisugiru | 純粋すぎます junsuisugimasu | “too ~”. |
| Looks ~ (~そう) | 純粋そう junsuisou | 純粋そうです junsuisoudesu | “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.