What is another word for "reason"?

Roget's Thesaurus (1911) lists these synonyms for "reason": absurd, absurdity, absurdness, all, alogy, and, anticlimax, arbitrary, are, armed, bathos, become, believe, blow, blunder, bold, bon, boutade, brain, bring, bull, camel, capriccio, caprice, capricious, captious, chase, clear, cold, come, contradictory, contrary, crotchet, crotchety, dare, delight, delusion, deserve, deuce, devil.