Definition
A criticism, question, remark, etc., that is expressed forcefully and causes discomfort or unease due to its intensity or because it brings up sensitive or difficult issues.
刻薄的批评（问题、评论）
She hadn't really meant to lie, but their piercing questions had forced her to.
她并不是真的想说谎，但他们尖锐的提问迫使她这么做。
He was famous for his piercing criticism in board meetings.
他在董事会会议中以其尖锐的批评而闻名。
If you think that kind of behavior is appropriate, you need to ask yourself some piercing questions.
如果你认为那种行为是合适的，你需要问自己一些尖锐的问题。