adj. 25B6; adjective
she is hesitant about buying : UNCERTAIN, undecided, unsure, doubtful, dubious, sceptical; tentative, nervous, reluctant; indecisive, irresolute, hesitating, dithering, vacillating, blowing hot and cold; ambivalent, in two minds; Brit. havering, humming and hawing; informal iffy.
a hesitant child : LACKING CONFIDENCE, diffident, timid, shy, bashful, insecure.
certain, decisive, confident.