Someone who is perspicacious notices, realizes, and understands things quickly. one of the most perspicacious and perceptive historians of that period. = perceptive + perspicacity per·spi·cac·ity Channel 4's overseas buyers have foreseen the audience demand with their usual perspicacity. good at judging and understanding people and situations = perceptive (perspicax, from perspicere; PERSPECTIVE)
mentally acute or penetratingly discerning; "too clear-eyed not to see what problems would follow"; "chaos could be prevented only by clear-sighted leadership"; "much too perspicacious to be taken in by so spurious an argument"
acutely insightful and wise; "much too perspicacious to be taken in by such a spurious argument"; "observant and thoughtful, he was given to asking sagacious questions"; "a source of valuable insights and sapient advice to educators"