invincible;  unrivaled;  unrivalled;  matchless;  unbeatable;  undefeatable
 daring;  fearless;  intrepid;  bold;  tough
 hostility;  animosity;  enmity
 hostility;  antagonism;  opposition
 formidable enemy;  strong enemy;  tough enemy
 friend and foe;  enemies and allies;  both sides
 enemy territory;  hostile place
 old enemy;  longtime enemy;  arch-enemy;  traditional rival;  longstanding foe
 looking on (somebody) as hostile
 foreign enemy;  outside invader
 hostile party;  enemy side
 great rival;  powerful enemy;  archenemy
 hostile nature;  inimical character
 enemy movements;  enemy's position
 in the midst of the enemy
 enemy of the emperor;  rebel against the imperial government
 enemy's strength or fighting power
 enemy's strength or fighting power
 role of the villain;  the bad guy
 mortal enemy;  sworn enemy;  nemesis
 remnants of an enemy army
 in the face of the enemy;  before the enemy
 unbeatable;  invincible;  irresistible
 enemy castle;  enemy fortress
 confronting the enemy;  hostilities
 opponent in a debate or argument
 in fooling the enemy first deceive your allies
 his true objective lies elsewhere;  there are ulterior motives at play; (lit.) the enemy is at Honnōji
 weak opponent;  weak enemy
 a friend today may turn against you tomorrow
 error made by the enemy or opposing team
 diversionary tactics;  concealing one's true motives until the last moment
 benefitting the enemy;  benefiting the enemy
 opponent's car (in racing games);  rival driver
 opponent's rook;  opponent's hisha
 rival company;  rival corporation