What is another word for "delusion"?

Roget's Thesaurus (1911) lists these synonyms for "delusion": absurd, absurdity, absurdness, all, alogy, anticlimax, away, bathos, believing, bigotry, blind, blunder, boutade, bull, catch, cheese, childish, conclusion, confident, confiding, contradictory, credo, credulity, credulous, credulousness, cullibility, deceive, deception, disorder, down, dupe, easily, egregious, escapade, exaggeration, extravagance, extravagant, fantastic, farce, farrago.