1. A way or method that is not clear, evident, or easily understood; an indirect or cryptic approach
He expressed his thoughts in an obscure manner that left everyone confused.
Ele expressou seus pensamentos de uma maneira obscura que deixou todos confusos.
2. An ambiguous or vague way of doing or saying something
The instructions were written in such an obscure manner that nobody could follow them.
As instruções foram escritas de uma maneira tão obscura que ninguém conseguiu segui-las.