Jisho

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Na-adjective (keiyodoshi), Noun
1. sharp (eyes, ears, etc.); keen; acute; sensitive
  • めがみ目が見えない
  • ひと
  • ちょうりょく聴力
  • えいびん鋭敏
  • ばあい場合
  • おお多い
A blind person's hearing is often very acute.
Na-adjective (keiyodoshi), Noun
2. sharp-witted; shrewd; clever; astute; acute

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