frighten (v.)
- affright
- agitate
- alarm
- alert
- appall
- arouse
- astound
- awe
- browbeat
- bulldoze
- cow
- daunt
- demoralize
- discompose
- disconcert
- dismay
- disquiet
- distress
- electrify
- faze
- fright
- funk
- horrify
- horripilate
- intimidate
- jar
- jolt
- panic
- perturb
- petrify
- scare
- shake
- shock
- spook
- stagger
- startle
- stun
- terrify
- terrorize
- unman
- unnerve
- unstring
- upset
- warn