thinker

1 a very smart person she's a very nice person, but she's no great thinker Synonyms brain, brainiac, intellect, genius, whiz, wiz, wizardRelated Words polyhistor, polymath, Renaissance man; blue, bluestocking, highbrow, intellectual; sage, savant; egghead, geek, longhair, nerd; master, virtuoso; ace, crackerjack (also crackajack), naturalNear Antonyms ignoramus, illiterate, know-nothing, lowbrow; anti-intellectual, philistine; ass, donkey, fool, jackass; beast, boor, cad, churl, clown, creep, cretin, cur, heel, jerk, louse, lout, skunk, snake, stinkerAntonyms blockhead, dodo, dolt, dope, dumbbell, dummy, dunce, fathead, goon, half-wit, hammerhead, idiot, imbecile, knucklehead, moron, nitwit, numskull (or numbskull), pinhead

2 the part of a person that feels, thinks, perceives, wills, and especially reasons loves crossword puzzles, bridge, and other pastimes that makes her use the old thinker Synonyms brain, cerebrum, head, psyche, mindRelated Words belfry, gray matter, intellect, intelligence, loaf [British slang], noodle, reason, skull; acumen, alertness, astuteness, brilliance, insight, judgment (or judgement), mentality, perception, perspicacity, sagacity, sapience, wisdom, wit; awareness, cognizance, consciousness, self-awareness, self-consciousness