oaf
airhead (slang) berk (Brit. slang) blockhead, bonehead (slang) booby, brute, charlie (Brit. informal) clod, coot, dickhead (slang) dickwit (slang) dipstick (Brit. slang) divvy (Brit. slang) dolt, dork (slang) dullard, dummy (slang) dunce, dweeb (U.S. slang) fathead (informal) fool, fuckwit (taboo slang) galoot (slang, chiefly U.S.) gawk, geek (slang) gobshite (Irish taboo slang) gonzo (slang) goon, gorilla (informal) halfwit, idiot, imbecile, jerk (slang, chiefly U.S. & Canad.) lout, lummox (informal) moron, nerd or nurd (slang) nincompoop, nitwit (informal) numbskull or numskull, numpty (Scot. informal) pillock (Brit. slang) plank (Brit. slang) plonker (slang) prat (slang) sap (slang) schmuck (U.S. slang) simpleton, twit (informal, chiefly Brit.) wally (slang)
Antonyms
brain (informal) egghead (informal) genius, intellect, smart aleck (informal) wiseacre