conceit Definition

conceit
noun

1. An inflated opinion of oneself.

Thesaurus: arrogance, vanity, narcissism, egotism, self-importance, swagger, smugness, complacency, self-satisfaction; Antonym: modesty, diffidence.
2. old use
A witty, fanciful or ingenious thought or idea.
Thesaurus: caprice, fancy, whim, vagary, fantasy.

Etymology: 16c: from conceive, by analogy with deceive, deceit.