Roget's Thesaurus: Entry 493 (Ignoramus)

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#493. Ignoramus.-- N. ignoramus, dunce; wooden spoon; no scholar.

[insulting terms for ignorant person: see also imbecility 499, folly 501] moron, imbecile, idiot; fool, jerk, nincompoop, asshole [vulgar].

[person with superficial knowledge] dilettante, sciolist[obs], smatterer, dabbler, half scholar; charlatan; wiseacre.

greenhorn, amateur &c (dupe) 547; novice, tyro &c (learner) 541; numskull.

lubber &c (bungler) 701; fool &c. 501; pedant &c 492. Adj. bookless[obs], shallow; ignorant &c. 491.

Phr. "a wit with dunces and a dunce with wits" [Pope].