(a.) Incapable of being defined or described; inexplicable.

aleatoric aleatory amorphous blobby blurred blurry broad chance chancy chaotic confused disordered enwrapped in mystery foggy fuzzy general hazy hit-or-miss ill-defined imprecise inaccurate inchoate incoherent incommunicable indecisive indefinite indescribable indeterminable indeterminate indistinct ineffable inenarrable inexact inexplicable inexpressible inextricable innominable insoluble insolvable lax loose mysterious mystic noncommunicable nonspecific obscure orderless random shadowed forth shadowy shapeless stochastic sweeping unaccountable unclear undefinable undefined undestined undetermined unexplainable uninterpretable unmentionable unnameable unplain unsolvable unspeakable unspecified untellable unutterable unwhisperable vague veiled