v. 25B6; verb
she hesitated, unsure of what to say : PAUSE, delay, wait, shilly-shally, dither, stall, temporize; be in two minds, be uncertain, be unsure, be doubtful, be indecisive, equivocate, vacillate, waver, blow hot and cold, have second thoughts; Brit. haver, hum and haw; informal dilly-dally.
don't hesitate to contact me : BE RELUCTANT, be unwilling, be disinclined, scruple; have misgivings about, have qualms about, shrink from, demur from, think twice about, baulk at.