Synonyms and related words :
arbitrary, blank, blankminded, brainless, calm, capricious, careless, emotionalistic, emotive, empty, empty-headed, fatuous, foolish, hammy, headless, heedless, histrionic, hysteric, ignorant, inadvertent, inane, incogitant, inconsiderate, inept, insensate, irrational, lackbrained, lean-minded, lean-witted, melodramatic, mindless, nirvanic, nonrational, not bright, oblivious, of little brain, overemotional, passive, pea-brained, pin-brained, quietistic, reasonless, relaxed, sensational, sensationalistic, senseless, slackminded, slackwitted, theatrical, thoughtfree, thoughtless, tranquil, uncalculating, ungifted, unguarded, unideaed, unintellectual, unintelligent, unoccupied, unreflecting, untalented, unthinking, unthoughtful, unwise, vacant, vacuous, witless