perceptive

"an acute observer of politics and politicians"; "incisive comments"; "icy knifelike reasoning"; "as sharp and incisive as the stroke of a fang"; "penetrating insight"; "frequent penetrative observations"

acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp

is similar to

quick to understand

"a kind and apprehensive friend"- Nathaniel Hawthorne

apprehensive, discerning

is similar to

able to relate new percepts to past experience

apperceptive

is similar to

exhibiting insight or clear and deep perception

"an insightful parent"; "the chapter is insightful and suggestive of new perspectives"-R.C.Angell

insightful

is similar to

quick to notice; showing quick and keen perception

observant, observing

is similar to

keenly perceptive or alert

"quick-sighted into the faults of the time"- Leonard Bacon

quick-sighted, sharp-eyed, sharp-sighted

is similar to

able to make fine distinctions

"a subtle mind"

subtle

is similar to

characterized by understanding based on comprehension and discernment and empathy

"an understanding friend"

understanding