1. An area or zone whose boundaries, characteristics, or status are not well-defined or ambiguous
The unclear region between the two territories caused diplomatic tension.
A região pouco clara entre os dois territórios causou tensão diplomática.
2. In academic or scientific contexts, an area of knowledge, data, or understanding that lacks clarity or precision
The unclear region in the research data required further investigation.
A região pouco clara nos dados da pesquisa exigiu investigação adicional.