verb (used with object), terrified, terrifying.
to fill with terror or alarm; make greatly afraid.

1565–75; < Latin terrificāre, equivalent to terr(ēre) to frighten + -ificāre -ify

terrifier, noun
terrifyingly, adverb
unterrified, adjective
unterrifying, adjective

See frighten.
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World English Dictionary
terrify (ˈtɛrɪˌfaɪ)
vb , -fies, -fying, -fied
(tr) to inspire fear or dread in; frighten greatly
[C16: from Latin terrificāre, from terrēre to alarm + facere to cause]

terrifying (ˈtɛrɪˌfaɪɪŋ)
causing great fear or dread; extremely frightening

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1570s, from L. terrificare "to frighten," from terrificus "causing terror" (see terrific).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The idea that this site was built to placate terrifying gods doesn't seem right
The footsteps are terrifying, all coming towards you and none going back again.
The sound of the wind blowing in trees was terrifying.
How heartbreaking for the parents and students and faculty, how terrifying for
  the community.
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