unaccountable (adj.)
- adrift
- afloat
- agnostic
- aimless
- alternating
- ambiguous
- amorphous
- antic
- baffling
- bizarre
- capricious
- casual
- causeless
- chancy
- changeable
- changeful
- chartered
- desultory
- dicey
- disobedient
- dizzy
- doubting
- eccentric
- equivocal
- erratic
- excused
- exempt
- extraordinary
- fanciful
- fantastic
- favored
- fickle
- fitful
- flickering
- flighty
- fluctuating
- freakish
- giddy
- haphazard
- headstrong
- heady
- hesitant
- hesitating
- immune
- impetuous
- impossible
- impulsive
- incalculable
- incomprehensible
- inconceivable
- inconsistent
- inconstant
- incredible
- indecisive
- indefinable
- indiscriminate
- inexplicable
- inextricable
- infirm
- inscrutable
- insoluble
- insolvable
- insubordinate
- irregular
- irresolute
- irresponsible
- lawless
- licensed
- licentious
- mazy
- mercurial
- mindless
- moody
- mutinous
- mysterious
- mystic
- odd
- peculiar
- polysemous
- privileged
- promiscuous
- purposeless
- puzzling
- rambling
- rampant
- random
- released
- restless
- roving
- scatterbrained
- self-willed
- shapeless
- shifting
- shifty
- skeptical
- spasmodic
- spineless
- stochastic
- strange
- stray
- touch-and-go
- unanswerable
- unbelievable
- unbridled
- uncanny
- uncertain
- unchecked
- uncontrolled
- unconvinced
- uncurbed
- undefinable
- undependable
- undirected
- undisciplined
- unexpected
- unexplainable
- unexplained
- unfathomable
- unfixed
- unforeseeable
- ungoverned
- unheard-of
- unimaginable
- unintelligible
- unmotivated
- unorthodox
- unpersuaded
- unpredictable
- unprovable
- unreliable
- unrestrained
- unsettled
- unsolvable
- unstable
- unsteady
- unsure
- unusual
- unverifiable
- vacillating
- vagrant
- variable
- volatile
- wandering
- wanton
- wavering
- wavy
- wayward
- weird
- whimsical
- wildcat
- willful
- wishy-washy
