careless

US /ˈker.ləs/
UK /ˈker.ləs/
"careless" picture
1.

négligent, insouciant, imprudent

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

:
It was careless of him to leave the door unlocked.
C'était négligent de sa part de laisser la porte déverrouillée.
He made a careless mistake on the exam.
Il a fait une erreur négligente à l'examen.
2.

insouciant, indifférent, désinvolte

not concerned or worried about something

:
She was careless of the consequences of her actions.
Elle était insouciante des conséquences de ses actes.
He seemed completely careless about his future.
Il semblait complètement insouciant de son avenir.