a person, organization, etc that is opposed to or actively hostile to somebody or something
(the enemy) (used as sing. or pl) a nation or military force with whom a country is or could be at war
(treated as sing. or pl) a military adversary or hostile military force
(used before a noun) belonging to a hostile adversary or force
enemy aircraft
something harmful or deadly
[Middle English via Old French enemi from Latin inimicus, from in-1 + amicus friend]