adjective
perspicacious
per-spih-KAY-shus/ˌpɜːrspɪˈkeɪʃəs/
Quick to understand things and judge them accurately.
The perspicacious detective notices the overlooked muddy footprint beside the window.

Etymology
Latin perspicax described sharp sight as well as mental discernment. Its image of seeing through something makes keen judgment a kind of vision: grasping what is not immediately apparent.
In context
empathy and understanding others and situations deeply is a big part of becoming perspicacious
More examples
- A perspicacious reader quickly sees why the narrator cannot be trusted.
- His perspicacious assessment helps us avoid a costly mistake.
- Our coach is perspicacious about which players work well together.
Forms
perspicacious · more perspicacious · most perspicacious
perspicacity noun — The ability to understand and judge accurately.
perspicaciously adverb — With quick understanding and accurate judgment.
Similar words
- perceptive
- Emphasizes noticing subtle details rather than judging their significance accurately.
- astute
- Often emphasizes practical judgment in business or difficult situations.
- insightful
- Emphasizes deep understanding rather than speed or accuracy of judgment.