See Words That Are Their Own Antonyms.
This information shamelessly ripped-off from Car Talk
Ter*rif"ic (?), a. [L. terrificus; fr. terrere to frighten + facere to make. See Terror, and Fact.]
Causing terror; adapted to excite great fear or dread; terrible; as, a terrific form; a terrific sight.
© Webster 1913.
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