(a.) Not explainable; incapable of being interpreted, or accounted for; as, an inexplicable mystery\.

aimless baffling bewildering casual causeless confounding designless driftless dysteleological enigmatic enwrapped in mystery haphazard incomprehensible indecipherable indefinable indescribable indiscriminate inextricable inscrutable insoluble insolvable mindless mysterious mystic mystifying odd peculiar perplexing promiscuous purposeless puzzling random stochastic strange stray unaccountable undefinable undirected unexplainable unfathomable unintelligible uninterpretable unmotivated unsolvable