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Definition of horrendous : Fearful; frightful.

Synonyms:

nasty, fearful, forbidding, obnoxious, rancid, fearsome, gruesome, nightmarish, shocking, dire, macabre, awful, intimidating, gross, horrid, ugly, repugnant, outrageous, fulsome, terrific, nauseating, monstrous, frightful, ghastly, repellent, grisly, hair-raising, hideous, sickening, horrifying, good, noisome, foul, disgusting, horrific, distasteful, abominable, repulsive, dreaded, evil, direful, spine-chilling, frightening, noxious, poor, nightmare, redoubtable, atrocious, horrible, scandalous, dread, alarming, scary, lurid, formidable, terrible, abhorrent, appalling, indecent, dreadful, terrifying, revolting, loathsome, obscene, taboo, nauseous

disagreeable, uncomfortable, anguishing, hurtful, acute, besetting, bothersome, inflaming, wrenching, smarting, gnawing, odious, irksome, oppressive, offensive, cramping, bitter, excruciating, aggravating, tormenting, torturing, troublesome, withering, biting, severe, cruel, annoying, aching, woeful, piercing, grievous, irritating, unbearable, trying, sore, painful, harrowing, arduous, miserable, throbbing, stabbing, crushing, burdensome, agonizing, chafing, stinging, unpleasant, cutting, distressful, grueling, insufferable

Usage examples:

• Instead, they moved back and forth with the Blue Sun and remained in their own area- a hot, dry, fiery- bright hinterland occupied only by gnurrs, gpoles, and other horrendous beasts. - "The Asses of Balaam", Gordon Randall Garrett.
• In the interests of academic fellowship we did our best to steer Sigurd clear of encounters with professorial champions, especially Jerry, an Irish terrier who would fight with his own shadow rather than not fight at all, but one morning our chapel vestibule was the scene of an encounter that Isaac Watts might well have called horrendous. - "Sigurd Our Golden Collie and Other Comrades of the Road", Katharine Lee Bates.
• Middle East Just this week, another horrendous terrorist act in Israel killed 19 and injured scores more. - "Complete State of the Union Addresses from 1790 to the Present", Various.