Synonyms for crackpot:
ignorant, brainless, moronic, blockheaded, cretinous, doltish, knuckle-headed, lame-brained, dim-witted, dumb, absurd, meat-headed, nonsensical, blithering, foolish, nitwit, bone-headed, goofy, chuckle-headed, asinine, idiotic, imbecilic, inane, loony, dopey, crazy, dotty, half-witted.
eccentric person (noun)
dumbbell, fool, lame-brain, loon, dolt, ignoramus, meathead, imbecile, moron, dummy, dullard, cretin, knuckle-head, blockhead, bungler, dunce, chuckle-head, clod, dimwit, half-wit, nincompoop, bonehead, simpleton.
Usage examples for crackpot:
- Entlore and Holson came along this time, as well as the ComOff; and all three were nonplussed and surprised to see each member of the " crackpot" group hurl the huge starship from one solar system to any other one desired, apparently merely by thinking about it. - "The Galaxy Primes", Edward Elmer Smith.
- General impression: slightly crackpot. - "Brink of Madness", Walter J. Sheldon.