1 uncertain, undetermined, undefined, imprecise, inexact, inexplicit, unspecified, unsettled, unfixed, unspecific, non-specific, vague, general, indeterminate, undecided, sub judice:
The time of the meeting was indefinite.
2 vague, unclear, obscure, confused, confusing, puzzling, baffling, cryptic, bewildering, mystifying, equivocal, ambiguous, unspecific, non-specific, inexplicit, inexact, imprecise:
Your directions for getting here were too indefinite.
3 ill-defined, undefined, blurred, blurry, hazy, indistinct, obscure, dim, fuzzy, unrecognizable, indistinguishable:
Indefinite shapes loomed in the fog.
4 unlimited, unknown, uncounted, uncountable, undefinable, indeterminate, indeterminable, unbounded, boundless, immeasurable, incalculable, limitless, endless, infinite:
He pondered the indefinite capacities of the mind.
5 hesitant, vague, shilly-shallying, vacillating, indecisive, undecided, inconstant, wavering, unsure, uncertain, Colloq wishy-washy:
She is still indefinite about going to the party.