1. A difficult or complex situation that is hard to resolve or understand
This is a complicated case that requires expert analysis.
Este é um caso complicado que requer análise de especialista.
2. A challenging legal, medical, or professional matter
The doctor said it was a complicated case and would need further investigation.
O médico disse que era um caso complicado e precisaria de investigação adicional.
3. A problematic or difficult person or situation
He's always been a complicated case, difficult to work with.
Ele sempre foi um caso complicado, difícil de trabalhar.