fearsome
adjective /ˈfɪəsəm/
  /ˈfɪrsəm/
 (formal)- making people feel very frightened
- a fearsome dinosaur
 - He has a fearsome reputation as a fighter.
 - a fearsome expression/sight
 
Oxford Collocations DictionaryFearsome is used with these nouns:- adversary
 - beast
 - reputation
 - …