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Inconsideration (noun)
Lack of due consideration; inattention to consequences, thoughtlessness.
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Inconsiderate (adjective)
Not considerate of others, thoughtless.
“Failing to replace the roll after using last of the toilet paper is very inconsiderate.”
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Inconsiderate (adjective)
inconsiderable
Wiktionary
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Inconsiderate (adjective)
thoughtlessly causing hurt or inconvenience to others
“it’s inconsiderate of her to go away without telling us”
Oxford Dictionary