subobscure
/ˌsʌbəˈskʊər, -ˈskʊr/Definitions
1. adjective
somewhat obscure or difficult to understand
“The subobscure references in the novel left many readers confused.”
2. adjective
not widely known or recognized, but potentially interesting or valuable
“The artist’s subobscure works are now being rediscovered by art historians.”
3. noun
something that is somewhat obscure or difficult to understand
“The subobscure concept of quantum entanglement is still not fully understood by scientists.”