1. (n.) An inconsistency absurdity, or impropriety, especially a nonstandard grammatical usage\; an impropriety or incongruity of language in the combination of words or parts of a sentence; esp., deviation from the idiom of a language or from the rules of syntax.

2. (n.) Any inconsistency, unfitness, absurdity, or impropriety, as in deeds or manners.

Irish bull anachronism anacoluthon antiphrasis argument argument by analogy argumentum ad baculum argumentum ad captandum argumentum ad hominem bad case barbarism begging the question bloomer blooper blunder boner boo-boo boob botch breach break bull bungle catachresis circular argument claptrap corruption crowd-pleasing argument empty words error fallacy fault faux pas flub fluff folk etymology formal fallacy fumble gaffe gaucherie grammatical error hypercorrection hyperform hysteron proteron impropriety incongruity inconsistency indecorum indiscretion infelicity insincere argument lapse logical fallacy malaprop malapropism marrowsky material fallacy mere rhetoric misconstruction mispronunciation missaying mistake misusage moonshine non sequitur paralogism petitio principii philosophism pseudosyllogism slip sophism sophistry spoonerism stupidity ungrammaticism verbal fallacy vernacularism violation vulgarism weak point