adj. 25B6; adjective
a mindless idiot : STUPID, idiotic, brainless, imbecilic, imbecile, asinine, witless, foolish, empty-headed, slow-witted, obtuse, feather-brained, doltish; informal dumb, pig-ignorant, brain-dead, cretinous, moronic, thick, birdbrained, pea-brained, dopey, dim, half-witted, dippy, fat-headed, boneheaded; N. Amer. informal chowderheaded.
mindless acts of vandalism : UNTHINKING, thoughtless, senseless, gratuitous, wanton, indiscriminate, unreasoning.
a mindless task : MECHANICAL, automatic, routine; tedious, boring, monotonous, brainless, mind-numbing.
25A0; mindless of INDIFFERENT TO, heedless of, unaware of, unmindful of, careless of, blind to.