Etymology
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hideous (adj.)

c. 1300, "terrifying, horrible, dreadful," from Anglo-French hidous, Old French hideus, earlier hisdos "hideous, horrible, awful, frightening" (11c.; Modern French hideux), from hisda "horror, fear," perhaps of Germanic origin. The old guess that it comes from Vulgar Latin *hispidosus, from Latin hispidus "shaggy, bristly," "presents numerous difficulties" [OED] and seems now to be generally discredited. Meaning "repulsive" is late 14c.

updated on July 13, 2015

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Definitions of hideous from WordNet

hideous (adj.)
grossly offensive to decency or morality; causing horror;
a hideous pattern of injustice
Synonyms: horrid / horrific / outrageous
hideous (adj.)
so extremely ugly as to be terrifying;
a hideous scar
Synonyms: repulsive
From wordnet.princeton.edu, not affiliated with etymonline.