完全 (kanzen) conjugation
perfection, completeness
完全 (かんぜん, kanzen) 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 | 完全だ kanzenda | 完全です kanzendesu | The form you look up. Also the casual “is ~”. |
| Negative | 完全じゃない kanzenjanai | 完全じゃないです kanzenjanaidesu | “is not ~”. |
| Past | 完全だった kanzendatta | 完全でした kanzendeshita | “was ~”. |
| Past negative | 完全じゃなかった kanzenjanakatta | 完全じゃなかったです kanzenjanakattadesu | “was not ~”. |
| Te-form | 完全で kanzende | — | Links to the next clause: “~ and …”. |
| Adverb | 完全に kanzenni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 完全な〜 kanzenna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 完全なら kanzennara | — | “if it is ~”. |
| Conditional (~たら) | 完全だったら kanzendattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 完全になる kanzenninaru | 完全になります kanzenninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 完全すぎる kanzensugiru | 完全すぎます kanzensugimasu | “too ~”. |
| Looks ~ (~そう) | 完全そう kanzensou | 完全そうです kanzensoudesu | “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.