enemy, opponent, opposition, foeman, fœdifragous, fossed, foetid, frighty, foulish, fœtid, more...

ally, friend, companion

enemy, rival, opponent, adversary, antagonist, competitor, foeman, opposer, more...

common, formidable, foreign, implacable, deadly, fallen, dangerous, mortal, bitter, old, powerful

axis enemy,   an enemy,   someone you hate,   common enemy,   old enemy,   someone you dislike,   love enemy,   greatest enemy,   my worst enemy,   object enemy