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The definition of frighten

Synonyms:	scare, shock, alarm, terrify, cow, appal, startle, intimidate, dismay, daunt, unnerve, petrify, unman, terrorize, affright (archaic), afraid, frozen, fluster, abashed, terror-stricken, terrifying, shocking, appalling, startling, dreadful, horrifying, menace, scary (informal), fearful, daunting, fearsome, spooky (informal), hair-raising, baleful, spine-chilling, bloodcurdling
Antonyms:	reassure

From Collins