健全 (kenzen) conjugation
health, soundness, wholesome
健全 (けんぜん, kenzen) 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 | 健全だ kenzenda | 健全です kenzendesu | The form you look up. Also the casual “is ~”. |
| Negative | 健全じゃない kenzenjanai | 健全じゃないです kenzenjanaidesu | “is not ~”. |
| Past | 健全だった kenzendatta | 健全でした kenzendeshita | “was ~”. |
| Past negative | 健全じゃなかった kenzenjanakatta | 健全じゃなかったです kenzenjanakattadesu | “was not ~”. |
| Te-form | 健全で kenzende | — | Links to the next clause: “~ and …”. |
| Adverb | 健全に kenzenni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 健全な〜 kenzenna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 健全なら kenzennara | — | “if it is ~”. |
| Conditional (~たら) | 健全だったら kenzendattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 健全になる kenzenninaru | 健全になります kenzenninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 健全すぎる kenzensugiru | 健全すぎます kenzensugimasu | “too ~”. |
| Looks ~ (~そう) | 健全そう kenzensou | 健全そうです kenzensoudesu | “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.