I. NATURE OF IDEAS COMMUNICATED
[Absence of meaning.] Unmeaningness.
empty sound, dead letter, vox et praeterea nihil; "a tale told by an idiot, full of sound and fury, signifying nothing"; "sounding brass and a tinkling cymbal."
nonsense, gibberish; jargon, jabber, mere words, hocus-pocus, fustian, rant, bombast, balderdash, palaver, flummery, verbiage, babble, baverdage, baragouin, platitude, niaiserie; inanity; flapdoodle; rigmarole, rodomontade; truism; nugae canorae; twaddle, twattle, fudge, trash; poppy-cock [U.S.]; stuff, stuff and nonsense; bosh, rubbish, moonshine, wish-wash, fiddle-faddle; absurdity [more]; vagueness (unintelligibility) [more].
[Adjectives] unmeaning; meaningless, senseless; nonsensical; void of sense [more].
inexpressive, unexpressive; vacant; not significant [more]; insignificant.
trashy, washy, trumpery, trivial, fiddle-faddle, twaddling, quibbling.
unmeant, not expressed; tacit (latent) [more].
inexpressile, undefinable, incommunicable.