Stochastic :  adj : being or having a random variable; "a stochastic variable"; "stochastic processes"

aimless, aleatoric, aleatory, amorphous, blobby, blurred, blurry, broad, casual, causeless, chance, chancy, chaotic, confused, designless, disordered, driftless, dysteleological, foggy, fuzzy, general, haphazard, hazy, hit-or-miss, ill-defined, imprecise, inaccurate, inchoate, incoherent, indecisive, indefinable, indefinite, indeterminable, indeterminate, indiscriminate, indistinct, inexact, inexplicable, lax, loose, mindless, nonspecific, obscure, orderless, promiscuous, purposeless, random, shadowed forth, shadowy, shapeless, stray, sweeping, unaccountable, unclear, undefined, undestined, undetermined, undirected, unmotivated, unplain, unspecified, vague, veiled,