astute Antonyms

preposterous thick thoughtless touched turbid undiscerning vacuous wacky wandering wayward weak-minded witless wooden absentminded addlepated around the bend barmy dotty thalian tactless purblind rabid rash reckless ridiculous risible scatter-brained sedentary senseless shallow shambling silly simple-minded slipshod slow slow-witted stupid kooky airheaded birdbrained dunderheaded imbecilic half-assed unintelligent muttonheaded pea-brained scatterbrained unsharpened slow on the uptake softheaded