The Oxford Thesaurus An A-Z Dictionary of Synonyms - uncertain adj.

1) unsure, indeterminate, unpredictable, undeterminable, unforeseeable, unascertainable, haphazard, chance, arbitrary, random, aleatory, serendipitous, hit-or-miss, casual: It is uncertain whether interest rates will rise again next month. 2) unsure, in or of two minds, vacillating, undecided, unclear, ambivalent, irresolute, indecisive, hesitant, hesitating, undetermined, shilly-shallying, Brit at a loose end, US at loose ends: Julia is uncertain about what to do next. 3) unsure, indeterminate, up in the air, indefinite, unpredictable, unresolved, unsettled, in the balance, conjectural, speculative, debatable, touch-and-go, unreliable, doubtful, dubious, questionable, vague, hazy: The future of the company is now uncertain. The results of the election are still uncertain. 4) variable, changeable, inconstant, unfixed, unsettled, irregular, fickle, erratic, fitful, unsteady, wavering, unreliable, sporadic, occasional; unmethodical, unsystematic: The pictures in the cave danced in the uncertain light of the torch. How can we make an appointment if your plans are so uncertain?