Synonyms of horrendous

1 Syllable

dread, dire

2 Syllables

sickie, horrid, scariest, heinous, scary, monstrous, fearful, ghastlier, dreaded, frightful, dreadful, ghastly, scarier, awful, hideous, grabber, beastly

3 Syllables

extreme, horrifyin, abhorrent, gruesome, ghostlike, outrageous, terrible, disturbing, harrowing, teratoid, appalling, horrible, dangerous, hateful, atrocious, disastrous, miscreated

4 Syllables

awe-inspiring, awesome, spine-chilling, desperate