[adj] 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"
[adj] lacking self-confidence; "stood in the doorway diffident and abashed"; "problems that call for bold not timid responses"; "a very unsure young man"
[adj] not safe from danger or mishap; "faced an uncertain future"; "an unsure existence"
Synonyms
ambivalent, diffident, doubtful, dubious, groping, hesitant, incertain, insecure, shy, timid, uncertain, unconfident, unsafe