scatterbrained (adj.)
- adrift
- afloat
- alternating
- amorphous
- blank
- brainless
- capricious
- changeable
- changeful
- dazed
- desultory
- dizzy
- dopey
- eccentric
- empty
- empty-headed
- erratic
- featherbrained
- fickle
- fitful
- flickering
- flighty
- fluctuating
- freakish
- frivolous
- gaga
- giddy
- harebrained
- hollow
- impetuous
- impulsive
- inane
- inconsistent
- inconstant
- indecisive
- infirm
- irregular
- irresolute
- irresponsible
- jejune
- mazy
- mercurial
- moody
- rambling
- rattlebrained
- rattlepated
- restless
- roving
- shapeless
- shifting
- shifty
- silly
- spasmodic
- spineless
- thoughtless
- unaccountable
- uncertain
- uncontrolled
- undependable
- undisciplined
- unfixed
- unpredictable
- unreliable
- unrestrained
- unsettled
- unstable
- unsteady
- vacant
- vacillating
- vacuous
- vagrant
- vapid
- variable
- volatile
- wandering
- wanton
- wavering
- wavy
- wayward
- whimsical
- wishy-washy
- witless
