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Adjective: unsure  ,ún'shûr or ún'shor [N. Amer], ún'shor or ,ún'shûr [Brit]
  1. Lacking self-confidence
    "a very unsure young man";
    - diffident, shy, timid
     
  2. Lacking or indicating lack of confidence or assurance
    "unsure of himself and his future"; "moving with unsure steps";
    - uncertain, incertain [non-standard]
     
  3. Not established beyond doubt; still undecided or unknown
    "an unsure future";
    - uncertain

See also: ambivalent, assurance, authority, certainty, confidence, doubtful, dubious, foregone conclusion, groping, indefinite, indeterminate, self-assurance, self-confidence, sure thing, sureness, undetermined, up in the air

Antonym: sure