1. The act of performing or fulfilling an obligation, duty, or contract in a careless, inattentive, or substandard manner that falls below acceptable standards
The contractor's negligent performance of the construction work resulted in structural defects.
O cumprimento negligente das obras de construção pelo empreiteiro resultou em defeitos estruturais.
2. In legal contexts, the failure to exercise reasonable care or diligence when carrying out contractual obligations or professional duties
The lawyer was sued for negligent performance of his duties to the client.
O advogado foi processado por cumprimento negligente de seus deveres para com o cliente.