unchallenged

adj.

未受到挑战的；不成问题的；未引起争论的；无异议的

1. He is in a position of unchallenged authority.
   他拥有绝对的权威。
2. But these advertising ventures are not going unchallenged.
   但是那些广告风险并没有受到挑战。
3. He is an unchallenged political leader.
   他是一位无可争议的领导人。
4. She could not allow such a claim to go unchallenged.
   她不能对这样的要求听任不管。

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Unchallenged - Education Week
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Mobilization of potent plasma bactericidal activity during systemic bacterial challenge. Role of group IIA phospholipase A2.