adj. 25B6; adjective
she felt very unsure : UNCONFIDENT, unassertive, insecure, hesitant, diffident, anxious, apprehensive.
Sally was unsure what to do : UNDECIDED, irresolute, dithering, equivocating, in two minds, in a quandary.
some teachers are unsure about the proposed strike : DUBIOUS, doubtful, sceptical, uncertain, unconvinced.
the date is unsure : NOT FIXED, undecided, uncertain.
confident.