重い (omoi) conjugation
heavy; serious
重い (おもい, omoi) 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 | 重い omoi | 重いです omoidesu | The form you look up. Also the casual “is ~”. |
| Negative | 重くない omokunai | 重くないです omokunaidesu | “is not ~”. |
| Past | 重かった omokatta | 重かったです omokattadesu | “was ~”. |
| Past negative | 重くなかった omokunakatta | 重くなかったです omokunakattadesu | “was not ~”. |
| Te-form | 重くて omokute | — | Links to the next clause: “~ and …”. |
| Adverb | 重く omoku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 重い〜 omoi〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 重ければ omokereba | — | “if it is ~”. |
| Conditional (~たら) | 重かったら omokattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 重くなる omokunaru | 重くなります omokunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 重すぎる omosugiru | 重すぎます omosugimasu | “too ~”. |
| Looks ~ (~そう) | 重そう omosou | 重そうです omosoudesu | “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.