thoughtlessness

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adj性质的同根词
thoughtful：深思的；体贴的；关切的。
thinking：思考的；思想的；有理性的；好思考的。
thoughtless：轻率的；欠考虑的；考虑不周的；不顾及他人的。
thinkable：能想到的；可相信的；可考虑的；可能的。
adv性质的同根词
thoughtfully：沉思地；体贴地，亲切地。
n性质的同根词
thought：思想；思考；想法；关心。
thinking：思考；思想；想法；意见；见解。
thoughtfulness：体贴；思虑。
v性质的同根词
thought：想，思考；认为（think的过去式和过去分词）。
thinking：思考（think的现在分词）。

Emotional pain is caused by any number of events: death of a loved one, a breakup, thoughtlessness or cruelty on the part of others.
情感痛苦是由任何数目的事件引起：一位所爱的人去世、分手，别人的无心或残忍。
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The loss of the vase pained the man GREatly and he deeply regretted his own thoughtlessness, which bought him this unrecoverable loss.
这件事使富人非常难过，他深深后悔自己的鲁莽带来的不可挽回的损失。
But the thoughtlessness of the debt deal—notably its failure to tackle any of the real sources of America’s fiscal problems, such as entitlement spending—raises a bigger worry.
但是，草率的负债协议没有解决美国财政的任何实际问题，如应得权益花费等，这引起了更多的忧虑。

Sir William's point is that the unfairness can often be the result of ignorance or thoughtlessness, not necessarily of a deliberate act.
ECONOMIST: Debating Lawrence The
Then, one day, the new girl was gone, and the Minotaur worried that, in a moment of thoughtlessness, he had gobbled her up.
NEWYORKER: Ziggurat