1. (a.) Inexplicable; free from control.

2. (a.) Not to be accounted for; inexplicable; not consonant with reason or rule; strange; mysterious.

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