TERRIFYING

terrific, terrifying

(adjective) causing extreme terror; “a terrifying wail”

Source: WordNet® 3.1

Adjective

terrifying (comparative more terrifying, superlative most terrifying)

Frightening or intimidating.

Synonym: Thesaurus:frightening

Of a formidable nature; terrific

Verb

terrifying

present participle of terrify

Source: Wiktionary

TERRIFY

Ter"ri*fy, v. t. [imp. & p. p. Terrified; p. pr. & vb. n. Terrifying.] Etym: [L. terrere to frighten + -fy: cf. F. terrifier, L. terrificare. See Terrific, and -fy.]

1. To make terrible. [Obs.] If the law, instead of aggravating and terrifying sin, shall give out license, it foils itself. Milton.

2. To alarm or shock with fear; to frighten. When ye shall hear of wars . . . be not terrified. Luke xxi. 9.

Source: Webster’s Unabridged Dictionary 1913 Edition