Nincompoop

['nɪŋkəmpuːp]

(noun.) a stupid foolish person.

Editor: Margie--From WordNet

(n.) A fool; a silly or stupid person.

Edited by Griffith

n. [Low.] Ninny.

Editor: Nat

n. a simpleton.

Typist: Rosa

Rawdon Crawley paid scarcely any attention to Dobbin, looking upon him as a good-natured nincompoop and under-bred City man. William Makepeace Thackeray. Vanity Fair.
Being among a lot of nincompoop girls, said Alfred. George Eliot. Middlemarch.
Such a set of nincompoops, like Mrs. Ballard's pupils walking two and two. George Eliot. Middlemarch.

Editor: Rena