negligent
/ˈnɛɡ.lɪ.d͡ʒənt/ adjective C1- Careless or inattentive. · grossly negligent· negligent behavior
- Culpable due to negligence. · prove someone negligent
From the library
Holmes strolled round the house with his hands in his pockets and a negligent air which was unusual with him.
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