1. an argument that contains logical errors, inconsistencies, or invalid reasoning that undermines its conclusion
The lawyer's flawed argument was quickly dismantled by the opposing counsel.
O argumento falho do advogado foi rapidamente desmontado pela acusação.
2. reasoning that fails to support its premise or contains fallacious logic
His flawed argument assumed facts that were never proven.
Seu argumento falho assumiu fatos que nunca foram comprovados.