Adjective: terrifying 'te-ru,fI-ing- Causing extreme terror
"a terrifying wail";
- terrific [archaic]
Verb: terrify 'te-ru,fI- 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