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Definition of horror : 1. A bristling up; a rising into roughness; tumultuous movement.
2. A painful emotion of fear, dread, and abhorrence; a shuddering with terror and detestation; the feeling inspired by something frightful and shocking.
3. A shaking, shivering, or shuddering, as in the cold fit which precedes a fever; in old medical writings, a chill of less severity than a rigor, and more marked than an algor.
4. That which excites horror or dread, or is horrible; gloom; dreariness.

Synonyms:

nuisance, adaptation, monstrosity, murder, aversion, mutual exclusiveness, (the) scum of the earth, cock-and-bull story, frightfulness, know-all, anxiety, horridness, fright, inconsistency, offense, detestation, affright, ass, allegory, cold feet, quagmire, misery, nausea, clash, anathema, hatred, epic, torment, dread, incompatibility, repugnance, dreadfulness, execration, repellency, classic, antipathy, ghastliness, grisliness, funk, repulsiveness, hideosity, battle, trouble, annoyance, a blot on the landscape, stress, comedy, shame, agony, grotesque, repulsion, plague, drama, fear, abomination, iniquity, detective, crisis, gruesomeness, hate, excrescence, loudmouth, repulsive force, torture, evil, black comedy, distaste, hideousness, repugnancy, chill, apprehension, curse, dislike, abhorrence, disgust, anecdote, revulsion, crime, trepidation, abuse, awe, mess, sight, alarm, love, public nuisance, creep, atrocity, panic, loathing, scare, fearfulness, eyesore, awfulness, standoff, vermin, villainy, tragedy, public enemy number one, wickedness, repellence, atrociousness, worst-case scenario, yob, ordeal

daemon, werewolf, apparition, bugbear, succubus, illusion, myth, Frankenstein, shadow, ghoul, specter, chimera, incubus, Dracula, bogey man, nightmare, monster, phantasm, phantom, spirit, ogre, ghost, terror, bugaboo, hobgoblin, vampire

limbo, mire, abyss, furnace, holocaust, bedlam, inferno, hell, gehenna, oven, Hades, purgatory, Styx, morass

Usage examples:

• I stared on her; and a kind of horror came on me. - "Oddsfish!", Robert Hugh Benson.
• " It's the twins," began her mother with a look of pleased horror. - "The Wrong Twin", Harry Leon Wilson.
• This put a very different face on crossing the river, and he gazed on the dark, swift stream with horror. - "Jack Haydon's Quest", John Finnemore.