Synonyms of frightening

1 Syllable

dread

2 Syllables

dreader, troublous, ghoulish, eerier, fiercest, louring, ghastlier, daunting, creepier, fiercer, spookish, ghastly, creepy

3 Syllables

forbidding, alarming, ghostlike, disturbing, distressing, truculent, perturbing, fearsome, appalling, macabre, minacious, unsettling, upsetting, bloodcurdling, menacing, hair-raising, unearthly

4 Syllables

unspeakable, awesome, redoubtable, formidable, disheartening

5 Syllables

unhospitable, hyperphysical, undescribable, intimidating, intimidation, unutterable, rebarbative, inexpressible, indefinable

6 Syllables

intimidatory, incommunicable