Meaning: Difficult to understand:
* Abstruse: Complex and difficult to understand, often due to being highly technical.
* Arcane: Known or understood by only a few people; mysterious.
* Cryptic: Having a meaning that is hidden or mysterious.
* Elusive: Difficult to find, catch, or understand.
* Inscrutable: Impossible to understand or interpret.
* Mystifying: Causing confusion or bewilderment.
* Unfathomable: Impossible to understand or comprehend.
Meaning: Not well-known or famous:
* Anonymous: Unknown or unnamed.
* Dim: Not well-known or prominent.
* Insignificant: Not important or noticeable.
* Minor: Of little importance or significance.
* Neglected: Not given enough attention.
* Uncelebrated: Not praised or recognized.
* Unremarkable: Not interesting or noteworthy.
Meaning: Difficult to see or perceive:
* Dim: Faintly lit; difficult to see clearly.
* Hidden: Concealed or out of sight.
* Murky: Dark and unclear; difficult to see through.
* Vague: Not clearly stated or defined; imprecise.
Other synonyms:
* Ambiguous: Having more than one possible meaning; unclear.
* Cloudy: Not clear or definite.
* Confusing: Making it difficult to understand.
* Opaque: Not transparent or clear.
* Shadowy: Mysterious or secretive.
The best synonym for "obscure" will depend on the specific context in which you are using it.