petty, trifling, small, superficial, piddling, wee, little, insignificant, frivolous, irrelevant, unimportant, nugatory, skin-deep, meaningless, mean, diminutive, slight, of no account, scanty, meager, inappreciable, microscopic, atomic, dribbling, nonessential, flimsy, inconsiderable, evanescent, vanishing, momentary, immaterial, indifferent, beside the point, minute, unessential, paltry, inferior, minor, small-minded, beggarly, useless, inconsequential, picayune, worthless, scurvy, mangy, trashy, pitiful, of little moment, dinky*, small-town*, rinky-dink*, two-bit*, nickle-and-dime*, piffling*, cutting no ice*, cut and dried*; see also shallow 2.
Antonyms important*, great, serious*.
