Synonyms For "Terrible" :

1 syllable:

bad, dread

2 syllables:

awful, dire, dreaded, dreadful, fearful, fearsome, frightful, intense, painful, severe, wicked

3 syllables:

alarming, atrocious, direful, frightening, horrendous, horrific, tremendous

4 syllables:

unspeakable

5 syllables:

abominable