Thoughtless and insensitive, often implying a lack of consideration, empathy, or gratitude towards others; sometimes used to describe someone who is guileless or naive.
他虽然平时看起来没心没肺的，但遇到朋友有困难时总是第一个伸出援手。
Although he usually seems thoughtless and carefree, he's always the first to offer help when his friends are in trouble.
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