See sagacity in Webster's New World Roget's A-Z Thesaurus II
noun
Skill in perceiving, discriminating, or judging:
acumen, astuteness, clear-sightedness, discernment, discrimination, eye, keenness, nose, penetration, perceptiveness, percipience, percipiency, perspicacity, sageness, shrewdness, wit. See ability, carefulDeep, thorough, or mature understanding:
insight, profundity, sagaciousness, sageness, sapience, wisdom. See wise
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