形容词
中文翻译：不败的
同义词：
['invincible', 'undefeated', 'invincible']
例句：
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1. The team is known for its undefeated record.
这个团队以不败的记录而闻名。
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2. He is considered an invincible warrior.
他被视为一个无敌的战士。
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3. The champions are undefeated and have won the championship three times.
冠军队伍从未输过，并且已经赢得了三次冠军。