1. Information or understanding that is not widely known, difficult to find, or understood by few people
His obscure knowledge of ancient Sanskrit texts impressed the scholars.
Seu conhecimento obscuro de textos antigos em sânscrito impressionou os estudiosos.
2. Specialized or esoteric information that requires deep study or research
She possessed obscure knowledge about the history of medieval printing.
Ela possuía conhecimento obscuro sobre a história da impressão medieval.