Inexplicable

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

Thesaurus Entries

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