youdao

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。

《柯林斯英汉双解大词典》

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。”

youdao

"The decision to postpone the game was taken thoughtlessly and too late, " said Marseille chairman Jean-Claude Dassier.

BBC: Postponement angers French clubs

Credit Bucksbaum's reputation for not jumping thoughtlessly into merger deals at every turn.

FORBES: General Growth Revives The All-Debt Deal

Of course, a dose of unease is always good in business, but too much causes everyone to press ahead thoughtlessly.

FORBES: Leaders Balance Urgency And Patience