frighten

Synonyms: affright agitate alarm appall astound awe browbeat bulldoze chill chill to the bone cow curdle the blood daunt demoralize deter disburb discomfort disconcert discourage dishearten dismay disquiet faze horrify intimidate make blood run cold make teeth chatter panic perturb petrify repel scare away scare off scare to death spook startle stiff strike terror into terrify terrorize unhinge unnerve

Antonyms: calm comfort exhilarate gladden