適当 (tekitou) conjugation
fitness, suitability
適当 (てきとう, tekitou) 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 | 適当だ tekitouda | 適当です tekitoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 適当じゃない tekitoujanai | 適当じゃないです tekitoujanaidesu | “is not ~”. |
| Past | 適当だった tekitoudatta | 適当でした tekitoudeshita | “was ~”. |
| Past negative | 適当じゃなかった tekitoujanakatta | 適当じゃなかったです tekitoujanakattadesu | “was not ~”. |
| Te-form | 適当で tekitoude | — | Links to the next clause: “~ and …”. |
| Adverb | 適当に tekitouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 適当な〜 tekitouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 適当なら tekitounara | — | “if it is ~”. |
| Conditional (~たら) | 適当だったら tekitoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 適当になる tekitouninaru | 適当になります tekitouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 適当すぎる tekitousugiru | 適当すぎます tekitousugimasu | “too ~”. |
| Looks ~ (~そう) | 適当そう tekitousou | 適当そうです tekitousoudesu | “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.