feel constrained and uneasy;be (put) out of countenance;feel uncomfortable and uneasy;(exceedingly) ill at ease ;

Cancer is a taboo subject and people are frightened or embarrassed to talk openly about it.
癌症是个禁忌话题,公开谈论它会让人们感到恐慌或局促不安。
来源:《柯林斯高阶英汉双解学习词典》Garland tried to appear casual, but he couldn't conquer his unease.
加兰努力装出无所谓的样子,可是他没法克服自己的局促不安。
来源:《柯林斯高阶英汉双解学习词典》
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