1. An explanation that is not valid, lacking in legal, logical, or factual basis; unacceptable or rejected as unsound
The court ruled that his explanation for missing the hearing was invalid.
O tribunal determinou que sua explicação pela falta à audiência era inválida.
2. In technical or computational contexts, an explanation that fails to meet required standards or parameters
The system rejected the invalid explanation provided in the form.
O sistema rejeitou a explicação inválida fornecida no formulário.