Synonyms of unsure

Adjective

1. diffident (vs. confident), shy, timid, unsure

usage: lacking self-confidence; "stood in the doorway diffident and abashed"; "problems that call for bold not timid responses"; "a very unsure young man"

2. uncertain (vs. certain), unsure (vs. sure), incertain, ambivalent, doubtful, dubious, groping

usage: lacking or indicating lack of confidence or assurance; "uncertain of his convictions"; "unsure of himself and his future"; "moving with uncertain (or unsure) steps"; "an uncertain smile"; "touched the ornaments with uncertain fingers"