trenchant
Meaning: incisive, forceful, sharply clear
Usage: The critic’s trenchant review exposed the film’s weak plot and shallow characters.
acumen
Meaning: keen insight
Usage: Because of his mathematical acumen, Larry was able to figure out in minutes problems that took other students hours.
acute
Meaning: sharp, severe 2. having keen insight
Usage: Because she was so acute, Libby instantly figured out how the magician pulled off his “magic.”
incisive
Meaning: clear, sharp, direct
Usage: The discussion wasn’t going anywhere until her incisive comment allowed everyone to see what the true issues were.