unopposed 

英汉解释

adj. 无对手的；不受反对的

反义词

a.   opposed

参考例句

1. The landing at the new sector was virtually unopposed.
在新防区的登陆几乎没有遭到任何抵抗。
2. If we were allowed to walk in unopposed, we treated the population much better.
若未遭抵抗就进得村镇，我们对待当地居民就会好得多。
3. Exogenous estrogen. Continuous exposure to unopposed estrogen results in endometrial hyperplasia.
外源性雌激素：长期暴露与无拮抗的雌激素环境下可导致内膜增生过长。

英英解释

adj.
  1. not having opposition or an opponent

网络释义

unopposed
不反对的; 无反对的; 不受反对;
elected unopposed
在无对手情况下当选; 没有对手而当选;
unopposed estrogens
释义：非对抗性雌激素;
unopposed candidate
无对手的候选人;
UNOP Unopposed
不反对的;