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