To emphasize the lack of clarity:
* Un-obscure: This is the most straightforward option, simply reversing the meaning.
* De-obscure: This implies a process of removing obscurity.
* Dis-obscure: Similar to "de-obscure," implying removal or elimination of obscurity.
To emphasize the hidden nature:
* Crypto-obscure: This emphasizes the concealed or hidden nature of something obscure.
* Latent-obscure: This emphasizes the hidden or potential nature of something obscure.
To emphasize the limited knowledge:
* Semi-obscure: This suggests something is partially obscure, or known by only a few.
* Partially-obscure: This is a less formal way of expressing "semi-obscure."
To emphasize the difficulty of understanding:
* Incomprehensible-obscure: This highlights the difficulty of understanding something obscure.
* Unfathomable-obscure: This emphasizes the extreme difficulty of understanding something obscure.
Note: The best prefix will depend on the specific context and the desired meaning.