強気 (tsuyoki) conjugation
firm, strong
強気 (つよき, tsuyoki) 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 | 強気だ tsuyokida | 強気です tsuyokidesu | The form you look up. Also the casual “is ~”. |
| Negative | 強気じゃない tsuyokijanai | 強気じゃないです tsuyokijanaidesu | “is not ~”. |
| Past | 強気だった tsuyokidatta | 強気でした tsuyokideshita | “was ~”. |
| Past negative | 強気じゃなかった tsuyokijanakatta | 強気じゃなかったです tsuyokijanakattadesu | “was not ~”. |
| Te-form | 強気で tsuyokide | — | Links to the next clause: “~ and …”. |
| Adverb | 強気に tsuyokini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 強気な〜 tsuyokina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 強気なら tsuyokinara | — | “if it is ~”. |
| Conditional (~たら) | 強気だったら tsuyokidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 強気になる tsuyokininaru | 強気になります tsuyokininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 強気すぎる tsuyokisugiru | 強気すぎます tsuyokisugimasu | “too ~”. |
| Looks ~ (~そう) | 強気そう tsuyokisou | 強気そうです tsuyokisoudesu | “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.