甚だしい (hanahadashii) conjugation
extreme, excessive, terrible
甚だしい (はなはだしい, hanahadashii) is an i-adjective. I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 甚だしい hanahadashii | 甚だしいです hanahadashiidesu | The form you look up. Also the casual “is ~”. |
| Negative | 甚だしくない hanahadashikunai | 甚だしくないです hanahadashikunaidesu | “is not ~”. |
| Past | 甚だしかった hanahadashikatta | 甚だしかったです hanahadashikattadesu | “was ~”. |
| Past negative | 甚だしくなかった hanahadashikunakatta | 甚だしくなかったです hanahadashikunakattadesu | “was not ~”. |
| Te-form | 甚だしくて hanahadashikute | — | Links to the next clause: “~ and …”. |
| Adverb | 甚だしく hanahadashiku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 甚だしい〜 hanahadashii〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 甚だしければ hanahadashikereba | — | “if it is ~”. |
| Conditional (~たら) | 甚だしかったら hanahadashikattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 甚だしくなる hanahadashikunaru | 甚だしくなります hanahadashikunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 甚だしすぎる hanahadashisugiru | 甚だしすぎます hanahadashisugimasu | “too ~”. |
| Looks ~ (~そう) | 甚だしそう hanahadashisou | 甚だしそうです hanahadashisoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
See the full rules in the adjective conjugation guide.