Definition of nonsense:
gab, rant, flounce, furbelow, twaddle, trash, rashness, poppycock, prattle, gibberish, berth, surface, insanity, trumpery, foolery, joke, giddiness, ruffle, scrawl, antics, frippery, tomfoolery, scribble, ruff, feed bunk, soft soap, small change, jargon, rot, wish-wash, folderol, gabble, madness, infatuation, garbage, unsteadiness, nonsensicality, piffle, crap, jest, built in bed, frill, jabberwocky, triviality, extravagance, words, small potatoes, steadiness, gas, palaver, knowledge, frivolity, folderal, codswallop, bull, prate, blatherskite, rubbish, guff, bunkum, applesauce, mumbo jumbo, gimcrack, trifle, imbecility, trivia, flightiness, rigmarole, falderol, important, froth, thoughtlessness, lunacy, zaniness, hokum, claptrap, pretense, malarkey, bunk bed, hooey, bunk, minutia, tripe, fiddle-faddle, bilge, fun, gimcrackery, consideration, ability, tommyrot, imprudence, bombast, buncombe.
absurdity (part of speech: noun)
- unmeaningness (part of speech: noun)
- foolishness (part of speech: noun)