1. A situation or subject that is not clearly defined; an area of ambiguity where rules, ethics, or legality are unclear
The contract has some gray areas that need clarification before signing.
O contrato tem algumas zonas cinzentas que precisam ser esclarecidas antes de assinar.
2. A middle ground between two extremes; something that is neither clearly right nor clearly wrong
Whether this practice is acceptable is a gray area in the industry.
Se esta prática é aceitável é uma zona cinzenta na indústria.