Earnest
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negligent, jerky, hilarious, phlegmatic, unserious, fatuous, purposeless, asinine, uproarious, cuckoo, unconcerned, insincere, crazy, joking, uninterested, light, mad, wobbly, daft, heedless, half-witted, apathetic, lunatic, sappy, cockeyed, kooky, loony, wacky, brainless, dispassionate, screwball, untrustworthy, unstable, stony, stolid, unimportant, frigid, indifferent, flippant, unenthusiastic, changeable, foolish, Unpassionate, unmindful, irresolute, insane, Weak-minded, zany, thoughtless, unwise, dotty, nonsensical, unthoughtful, unpurposeful, Daffy, cold, unfixed, jesting, senseless, witless, regardless, nutty, unmoved, calm, kittenish, unsteady, wavering, cool, balmy, unexcited, inconstant, loose, trivial, careless, weak.