Synonyms for Nincompoop:

n.

joker, clown, numpty, dumb blond, maniac. Mooncalf, schmuck, ability, tomfool, ding-dong, nerd, goose, jerk, schmo, turkey, simple, softhead, goof, gander, dip. fool (noun)
dummy, blockhead, nitwit, fool, dumbbell, half-wit, lame-brain, dimwit, loon, clod, dolt, simpleton, meathead, chuckle-head, imbecile, bonehead, knuckle-head, moron, dullard, crackpot, ignoramus, bungler, dunce, cretin.
idiot (noun)
clod, imbecile, moron, nitwit, dolt, simpleton, ninny, fool, jerk, blockhead.
nincompoop (noun)
ninny.
person (noun)
ninny.
schmuck (noun)
schmuck.
stupid person (noun)
dunce.

Other synonyms:

schmuck, softhead, nerd, schmo, ding-dong, tomfool. goose, goof, Mooncalf, turkey. gander. simple. Other relevant words:
joker, jerk, schmo, ninny, ability, clown, goose, simple, turkey, ding-dong, schmuck, gander, tomfool, numpty, dip, maniac, Mooncalf, nerd, softhead, goof.

Usage examples for nincompoop

  1. " Oh, I'm not such a nincompoop as you might suspect, madam," said I, testily, far from complimented. – A Fool and His Money by George Barr McCutcheon
  2. If he hinted that a certain new comer impressed him unfavorably, the nincompoop was summarily kicked out of society. – Hoosier Mosaics by Maurice Thompson
  3. But Rachel, though she is inclined to be tyrannical, is not such a downright positive old blue- bottle nincompoop as that white- wigged king of kings. – The Landleaguers by Anthony Trollope