急激 (kyuugeki) conjugation
sudden, precipitous, radical
急激 (きゅうげき, kyuugeki) 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 | 急激だ kyuugekida | 急激です kyuugekidesu | The form you look up. Also the casual “is ~”. |
| Negative | 急激じゃない kyuugekijanai | 急激じゃないです kyuugekijanaidesu | “is not ~”. |
| Past | 急激だった kyuugekidatta | 急激でした kyuugekideshita | “was ~”. |
| Past negative | 急激じゃなかった kyuugekijanakatta | 急激じゃなかったです kyuugekijanakattadesu | “was not ~”. |
| Te-form | 急激で kyuugekide | — | Links to the next clause: “~ and …”. |
| Adverb | 急激に kyuugekini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 急激な〜 kyuugekina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 急激なら kyuugekinara | — | “if it is ~”. |
| Conditional (~たら) | 急激だったら kyuugekidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 急激になる kyuugekininaru | 急激になります kyuugekininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 急激すぎる kyuugekisugiru | 急激すぎます kyuugekisugimasu | “too ~”. |
| Looks ~ (~そう) | 急激そう kyuugekisou | 急激そうです kyuugekisoudesu | “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.