1. a careless, untidy, or sloppy way of doing things; lack of care or attention to detail
He dressed in a slovenly manner, with wrinkled clothes and uncombed hair.
Ele se vestia de modo desleixado, com roupas amassadas e cabelo despenteado.
2. behavior or conduct characterized by negligence and poor standards
The work was completed in a slovenly manner, full of errors and oversights.
O trabalho foi realizado de maneira desleixada, cheio de erros e omissões.