Synonyms of dreadfulness

2 Syllables
monster, mutant, horror
3 Syllables
hideousness, eyesore, freakishness, heinousness, frightfulness, awfulness, ghastliness, mutation
4 Syllables
grotesqueness, gruesomeness, monstrosities, enormity, monstrosity, atrocity, deformity
5 Syllables
abnormality