absurd (part of speech: adjective)
idiotic, nonsensical, inconsistent, absurd, farcical, irrational, crazy, impossible, foolish, invalid, paradoxical, implausible, ridiculous, outlandish, bizarre, ludicrous, illogical, meaningless, anachronistic, silly, senseless, preposterous, stupid, incongruous, eccentric, contradictory, fallacious, self-contradictory
thoughtless (part of speech: adjective)
foolish (part of speech: adjective)
dim-witted, jackass, half-witted, dopey, asinine, ignorant, dumb, doltish, chuckle-headed, brainless, meat-headed, lame-brained, imbecilic, nitwit, blockheaded, crackpot, dotty, cretinous, knuckle-headed, moronic, loony, bone-headed, blithering, goofy
- Caused fifteen drops to be given to the low comedian of a Broadway Theatre, and that night he was positively dressed more like a man than a monkey, actually spoke some lines of the author, made only three inane attempts at puerile witticisms- only twice went out of his way to introduce some grossly indelicate line into his part, and for a wonder, lost so much of his self- conceit that for a full half- hour he did not believe himself the greatest comedian in the world. - "Doesticks, What He Says", Q. K. Philander Doesticks.
- Once again, in the course of her wanderings, she came opposite the picture of the old- fashioned child- the child whose hair was curled in primitive and stiff ringlets, whose blue eyes looked out at the world with a somewhat meaningless stare, and whose impossible and rosy lips were pursed up in an inane smile. - "The Children of Wilton Chase", Mrs. L. T. Meade.
- Their conversation was rambling and inane, especially when heard from one end only, and it took them almost ten minutes to confirm their Saturday night date. - "The Fourth R", George Oliver Smith.