blather(noun, verb) noun1. foolish gibberishSimilar word(s): blatherskiteDefinition categories: communication, gibber, gibberish verb1. to talk foolishlySimilar word(s): babble, blether, blither, smatterDefinition categories: communication, blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, twaddle