pointless

frivolous, inconsequential, inconsiderable, insignificant, minor, negligible, slight, trifling, trivial, unimportant

absurd, asinine, balmy, brainless, crazy, empty-headed, fatuous, foolish, half-witted, harebrained, insane, loony (also looney), lunatic, mad, mindless, nonsensical, nutty, preposterous, stupid, tomfool, unintelligent, unwise, weak-minded, witless, zany

irrational, unreasonable

aimless, haphazard, purposeless