Horrific

google

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mid 17th century: from Latin horrificus, from horrere ‘tremble, shudder’ (see horrid).

wiktionary

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Borrowed from Latin horrificus, from horreō(“to be afraid”) + -ficō(“to make”).

etymonline

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horrific (adj.)

"causing horror," 1650s, from French horrifique or directly from Latin horrificus "dreadful, exciting terror," literally "making the hair stand on end," from horrere "be terrified, bristle, to stand on end" (see horror) + -ficus "making, doing," from combining form of facere "to make, to do" (from PIE root *dhe- "to set, put"). An older adjective was horriferous (1620s). Related: Horrifically.