Synonyms of fearsome

2 Syllables
scary, frightful, striking, shocking, grabber
3 Syllables
tremendous, terrible, distressing, frightening, terrifying, nightmarish, traumatic, horrible, panicky, ascared, powerful, unsafe, imposing, massive
4 Syllables
awe-inspiring, awesome, redoubtable, formidable, impressive
5 Syllables
intimidating