If you describe someone as thoughtless, you are critical of them because they forget or ignore other people's wants, needs, or feelings.
双语例句
例： a small minority of thoughtless and inconsiderate people.
一小部分不顾及别人、不替别人着想的人。
例： It was a thoughtless remark and I regretted it immediately.
这是一句欠考虑的话，我马上就后悔了。