Synonyms of horrible

1 Syllable
cruel, mean, grim
2 Syllables
eerie, heinous, scary, monstrous, creepier, lurid, squalid, spookish, dreadful, awful, creepy, deathly, dismal, fiercest, lousy, fiercer, shocking, grabber, horrid, ghastlier, nastier, frightful, porno, ghastly, hellish, fairy, ghoulish, grisly, sickie, fearful, unkind, lousier, icky, hideous, nasty, nastiest, beastly
3 Syllables
loathsome, gruesome, outrageous, obscene, teratoid, ungodly, revolting, repellent, shameful, unholy, terrifying, nightmarish, obnoxious, horrendous, disgusting, scandalous, terrible, terrific, traumatic, appalling, miscreated, abhorrent, ghostlike, fearsome, macabre, nefarious
4 Syllables
detestable, disagreeable, awesome, repulsive, execrable, unspeakable, offensive, defunctive, scatologic
5 Syllables
undescribable, abominable, inexpressible, indefinable, unutterable
6 Syllables
incommunicable