undefeated
adj. 未被击败的
反义词
参考例子
1.He'll stay undefeated and set up even bigger events for 2010, which leads us to the last question.
他将保持不败战绩，甚至排了2010年的大赛日程，这也就导出了我们的下一个问题。
2.Our opponents are undefeated at home and have also not conceded more than two goals in any match this season.
我们的对手是在家不击败而且也有不在任何里面承认超过二个目标比赛这季节。
3.Everything about him was old except his eyes and they were the same color as the sea and were cheerful and undefeated.
所有和他相关的一切都是老的，除了他的双眼，它们是和海一样的颜色，愉快而永不言败。
英文解释
adj.
1.victorious
网络释义
undefeated
未被击败;
The Undefeated
没有被斗败的人; 无懈可击;
T Undefeated Losers
激流金属;