unforethoughtful
adjective
UK: /ʌnfɔːˈθɔːtfʊl/
US: /ʌnfɔːrˈθɔːtfʊl/
Not thinking about the possible bad effects or results of what you are doing; careless.
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It was unforethoughtful of him to forget her birthday.
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Her unforethoughtful remark caused an awkward silence during the important business meeting.
Showing a lack of consideration for other people; thoughtless.
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It's unforethoughtful to play loud music late at night.
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His unforethoughtful actions proved detrimental to the company's long-term goals.