恐ろしい (osoroshii) conjugation
terrible, dreadful
恐ろしい (おそろしい, osoroshii) 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 | 恐ろしい osoroshii | 恐ろしいです osoroshiidesu | The form you look up. Also the casual “is ~”. |
| Negative | 恐ろしくない osoroshikunai | 恐ろしくないです osoroshikunaidesu | “is not ~”. |
| Past | 恐ろしかった osoroshikatta | 恐ろしかったです osoroshikattadesu | “was ~”. |
| Past negative | 恐ろしくなかった osoroshikunakatta | 恐ろしくなかったです osoroshikunakattadesu | “was not ~”. |
| Te-form | 恐ろしくて osoroshikute | — | Links to the next clause: “~ and …”. |
| Adverb | 恐ろしく osoroshiku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 恐ろしい〜 osoroshii〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 恐ろしければ osoroshikereba | — | “if it is ~”. |
| Conditional (~たら) | 恐ろしかったら osoroshikattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 恐ろしくなる osoroshikunaru | 恐ろしくなります osoroshikunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 恐ろしすぎる osoroshisugiru | 恐ろしすぎます osoroshisugimasu | “too ~”. |
| Looks ~ (~そう) | 恐ろしそう osoroshisou | 恐ろしそうです osoroshisoudesu | “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.