n. The fact or quality of being false; falseness; dishonest purpose or intention; treachery; deceitfulness; perfidy: opposed to truthfulness.n. That which is false; a false representation in word or deed; an untruth; a lie: as, the tale is a series of falsehoods; to act a falsehood.n. False manifestation or procedure; deceitful speech, action, or appearance; counterfeit; imposture; specifically, in law, a fraudulent imitation or suppression of truth to the prejudice of another.n. Synonyms Falsehood, Falseness, Falsity; untruth, fabrication, fiction. Instances may be quoted in abundance from old authors to show that the first three words are often strictly synonymous; but the modern tendency has been decidedly in favor of separating them, falsehood standing for the concrete thing, an intentional lie; falseness, for the quality of being guiltily false or treacherous: as, he is justly despised for his falseness to his oath; and falsity, for the quality of being false without blame: as, the falsity of reasoning.