他对讲座内容有个模糊的印象，但说不出任何细节。

He had a ___vague sense of what the lecture was about but couldn't articulate any details.

她含糊的回答表明她没有完全理解这个问题的复杂性。

Her ___vague answer suggested she hadn't fully grasped the complexity of the question.

当被追问具体细节时，他只是含糊地耸耸肩并转移了话题。

When pressed for specifics, he just offered a ___vague shrug and a change of subject.