Keen perception is the ability to understand and interpret situations quickly and accurately. ACUMEN, ACUITY, TACT, INSIGHT, EAR, and WITS are all words that can be used to describe this concept. ACUMEN is a sharpness of judgment or discernment, ACUITY is keenness of perception or discernment, TACT is the ability to deal with people in a sensitive and effective way, INSIGHT is the capacity to gain an accurate and deep understanding of someone or something, EAR is the faculty of perceiving sound, and WITS is intelligence or good judgment. Together, these words can be used to describe keen perception.