Perspicacity (also called perspicaciousness) is a penetrating discernment (from the Latin perspicācitās, meaning throughsightedness, discrimination)—a clarity of vision or intellect which provides a deep understanding and insight. It extends the concept of wisdom by denoting a keenness of sense and intelligence applied to insight.

perspicacity noun /ˌpɜːspɪˈkæsəti/ /ˌpɜːrspɪˈkæsəti/ [uncountable] (formal) the ability to understand somebody/something very quickly and accurately synonym perceptiveness