"unsure" in the adjective sense
1. diffident, shy, timid, unsure
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, unsure, incertain
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"
Source: WordNet® (An amazing lexical database of English)
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