円滑 (enkatsu) conjugation
harmony, smoothness
円滑 (えんかつ, enkatsu) 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 | 円滑だ enkatsuda | 円滑です enkatsudesu | The form you look up. Also the casual “is ~”. |
| Negative | 円滑じゃない enkatsujanai | 円滑じゃないです enkatsujanaidesu | “is not ~”. |
| Past | 円滑だった enkatsudatta | 円滑でした enkatsudeshita | “was ~”. |
| Past negative | 円滑じゃなかった enkatsujanakatta | 円滑じゃなかったです enkatsujanakattadesu | “was not ~”. |
| Te-form | 円滑で enkatsude | — | Links to the next clause: “~ and …”. |
| Adverb | 円滑に enkatsuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 円滑な〜 enkatsuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 円滑なら enkatsunara | — | “if it is ~”. |
| Conditional (~たら) | 円滑だったら enkatsudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 円滑になる enkatsuninaru | 円滑になります enkatsuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 円滑すぎる enkatsusugiru | 円滑すぎます enkatsusugimasu | “too ~”. |
| Looks ~ (~そう) | 円滑そう enkatsusou | 円滑そうです enkatsusoudesu | “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.