careless
US /ˈker.ləs/
UK /ˈker.ləs/
1.
not giving enough attention and thought to what you are doing, with the result that you make mistakes, damage things, or cause harm to someone
:
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It was careless of him to leave the door unlocked.
•
He made a careless mistake on the exam.
2.
not concerned or worried about something
:
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She was careless of the consequences of her actions.
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He seemed completely careless about his future.