They thoughtlessly planned a picnic without him.

他们考虑不周，安排了一次野餐却没带上他。

As she was crossing to the day-nursery he added thoughtlessly, "And shut that window."

当她走到孩子们的日间活动室去的时候，他又不假思索地加了一句：“把窗子关上。”

I wandered in a forest thoughtlessly.

我在树林里无思无虑地漫步。

The principle is repeatedly and thoughtlessly violated.

这条原则被一再无情地违犯着。

To use, consume, spend, or expend thoughtlessly or carelessly.

浪费，挥霍无节制地或浪费地消费或支出；