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You can use unsuspecting to describe someone who is not at all aware of something that is happening or going to happen.
She threw a surprise party for her unsuspecting husband.
她为她毫不知情的丈夫举办了一个惊喜派对。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。