1) Affright 2) Alarm 3) Cause alarm 4) Cause fear 5) Cause fear in 6) Drive out by frightening 7) Drive out by ing 8) Excite 9) Fill with fear 10) Fright 11) Frighten away 12) Frighten off 13) Horrify 14) Panic 15) Petrify 16) Scare 17) Shake 18) Shake up 19) Shock 20) Stimulate 21) Stir 22) Terrify Found on https://www.crosswordclues.com/clue/frighten
Fright'en transitive verb [ imperfect Frightened ; present participle & verbal noun Frightening .] [ See Fright , transitive verb ] To disturb with fear; to throw into a state of alarm or fright; to affrigh... Found on http://www.encyclo.co.uk/webster/F/77
to make afraid or fearful; throw into a fright; terrify; scare. · to drive (usually fol. by away, off, etc.) by scaring: to frighten away pigeons from the roof. Found on https://www.infoplease.com/dictionary/frighten