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sagacity; cleverness
聡敏な少年が難問をたちどころに解いた。
The clever boy solved the difficult problem instantly.
聡敏な判断力で危機を切り抜けた。
He got through the crisis with shrewd judgment.
聡敏さを見込まれて重要な役目を任された。
He was entrusted with an important role thanks to his sagacity.