showing no sign of intelligence or understandingthe usual vacuous comments from the chat-show host
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in the sense of blank
showing no interest or expressionHe gave him a blank look.
in the sense of inane
senseless or sillyHe always had this inane grin.
in the sense of stupid
trivial, silly, or childishI wouldn't call it art. It's just stupid and tasteless.You won't go and do anything stupid, will you?
vacuous 的词库—— 柯林斯 英语词库
Life on the edge