adjective
Etymology: from present participle of terrify
1. : causing terror or apprehension : frightening
the most terrifying things he met on his travels were the marching ants of Tanganyika — Irish Digest
ascent of a terrifying icefall — Raymond Holden
his terrifying insistence upon appalling and merciless retribution — W.L.Sullivan
2. : of a formidable nature : awesome , tremendous
the terrifying formality … of the great drawing rooms of Paris — Elinor Wylie
a terrifying and voracious erudition — Morris Watnick
take a terrifying leap to the unimaginable range of temperatures … in the universe — Gerard Piel
• ter·ri·fy·ing·ly ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ ̷ ̷, ˌ ̷ ̷ ̷ ̷ˈ ̷ ̷ ̷ ̷ ̷ ̷ adverb