1. Insufficient or unconvincing evidence that fails to establish a claim or support an argument in legal, scientific, or rhetorical contexts
The prosecution's case was built on weak evidence and circumstantial testimony.
O caso do promotor foi construído sobre prova fraca e depoimento circunstancial.
2. A test or examination performance that demonstrates poor understanding or inadequate knowledge
His weak performance on the exam indicated he hadn't studied enough.
Sua prova fraca no exame indicava que ele não havia estudado o suficiente.