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Adjective: terrifying  'te-ru,fI-ing
  1. Causing extreme terror
    "a terrifying wail";
    - terrific [archaic]
Verb: terrify  'te-ru,fI
  1. Fill with terror; frighten greatly
    "he was terrified by the large dog";
    - terrorize, terrorise [Brit]

See also: alarming

Type of: affright, fright [archaic], frighten, scare

Encyclopedia: Terrifying

Terrify