1. Evidence or proof that is inadequate or lacking in quality or quantity to establish or support a claim, argument, or legal case
The court dismissed the case due to insufficient evidence.
O tribunal arquivou o caso por falta de prova insuficiente.
2. In legal contexts, a lack of convincing or credible proof required to meet the burden of proof
The prosecution presented insufficient evidence to convict the defendant.
A acusação apresentou prova insuficiente para condenar o réu.