Definition of frighten:
appall, affright, pall, entice, scare off, deter, frighten away, demoralize, faze, perturb, encourage, fascinate, awe, scare the daylights out of, badger, discomfort, daunt, dash, fright, terrorize, discourage, scare, hearten, fear, dishearten, scarify, inveigle, repel, stampede, scare away, dispirit, stave off, spook, disquiet, cow, frighten off, abash, appal.
- alarm (part of speech: verb)
- threaten (part of speech: verb)
- frighten (part of speech: verb)