1. A business transaction or commercial arrangement that causes harm, loss, or disadvantage to one or more parties involved
That contract turned out to be a prejudicial business arrangement for the company.
Aquele contrato resultou ser um negócio prejudicial para a empresa.
2. An unfavorable or detrimental commercial agreement
Investing in that company proved to be a prejudicial deal.
Investir naquela empresa provou ser um negócio prejudicial.