同仇敌忾的反义词有:亲痛仇快、自相残杀、同室操戈
◎同仇敌忾tóngchóu-díkài
[share a bitter hatred of enemy;a common danger causes common action;with bitter hatred against the common enemy] 全体一致地抱着对敌人的仇恨和愤怒