Highlighting the difficulty of understanding:
* The ancient text was so obscure that even the most learned scholars struggled to decipher its meaning.
* Her motives remained obscure, leaving everyone to speculate about her true intentions.
Focusing on the lack of prominence:
* The artist lived a life of obscurity, her talent unrecognized by the world.
* The small village was nestled in an obscure corner of the country, rarely visited by outsiders.
Emphasizing the concealment of something:
* The truth was obscure, hidden behind a veil of lies and deceit.
* The evidence was deliberately obscured, making it impossible to prove his guilt.
Using it in a metaphorical sense:
* The future was obscure, a dark and uncertain path ahead.
* Her thoughts were obscure, clouded by grief and confusion.
The best sentence for you will depend on the specific context and meaning you want to convey.