ARCHENEMY
Meaning of ARCHENEMY in English
arch ‧ en ‧ e ‧ my /ˌɑːtʃˈenəmi, ˌɑːtʃˈenɪmi $ ˌɑːrtʃ-/ BrE AmE noun ( plural archenemies ) [countable]
the main enemy
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012