THESAURUS
scatterbrained
adrift, afloat, alternating, amorphous, blank, brainless, capricious, changeable, changeful, dazed, desultory, deviable, dippy, dizzy, dopey, eccentric, empty, empty-headed, empty-minded, empty-pated, empty-skulled, erratic, fast and loose, featherbrained, featherheaded, fickle, fitful, flibbertigibbet, flickering, flighty, flitting, fluctuating, fluttery, freakish, frivolous, gaga, giddy, giddy-brained, giddy-headed, giddy-pated, giddy-witted, harebrain, harebrained, hollow, impetuous, impulsive, inane, inconsistent, inconstant, indecisive, infirm, irregular, irresolute, irresponsible, jejune, mazy, mercurial, moody, rambling, rattlebrained, rattleheaded, rattlepated, restless, roving, scramblebrained, shapeless, shatterbrained, shifting, shifty, shuffling, silly, spasmodic, spineless, thoughtless, unaccountable, uncertain, uncontrolled, undependable, undisciplined, unfixed, unpredictable, unreliable, unrestrained, unsettled, unstable, unstable as water, unstaid, unsteadfast, unsteady, vacant, vacillating, vacuous, vagrant, vapid, variable, vicissitudinary, vicissitudinous, volatile, wandering, wanton, wavering, wavery, wavy, wayward, whimsical, wishy-washy, witless
