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