1. A border or boundary line between territories, regions, or jurisdictions that lacks clear definition, precise demarcation, or official recognition
The fronteira indeterminada between the two countries has been a source of ongoing disputes.
A fronteira indeterminada entre os dois países tem sido fonte de disputas contínuas.
2. In a broader sense, any unclear or ambiguous boundary between concepts, ideas, or areas of responsibility
There is a fronteira indeterminada between where government responsibility ends and private enterprise begins.
Existe uma fronteira indeterminada entre onde termina a responsabilidade governamental e começa a empresa privada.