serious; grave(▼graveのほうがseriousよりも心をわずらわす程度が大きい)
- 事は重大になってきた[重大化してきた]
- The situation has become serious [critical].(▼criticalは危急の状態に)
- あまり重大に考えないでくれ
- Don't take it too seriously.
- 彼の誤解が重大な結果をもたらした
- His misunderstanding had [brought about] grave consequences.
- 君の選択が重大な影響を及ぼす
- Your choice will have far-reaching consequences.
- 責任重大だ
- It's 「a great [《口》 an awful] responsibility.