(a.) Conjectural; able to conjecture.

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