We found one dictionary that defines the word mortal enemies:

General (1 matching dictionary)

1. mortal enemies: Vocabulary.com

Types: archenemies, nemeses, antagonists, more... ▸ Words similar to mortal enemies ▸ Usage examples for mortal enemies ▸ Idioms related to mortal enemies ▸ Wikipedia articles (New!) ▸ Words that often appear near mortal enemies ▸ Rhymes of mortal enemies ▸ Invented words related to mortal enemies