obscure
ub-SKYOORadjMeaning not clear or easy to understand; also, not well known
Memory hook ob-SCURE: so dim, no one is SURE. Through the thick fog, Sven can barely make out a shape on the water: a boat? a whale? No one is sure. It is obscure.
The joke was too obscure for anyone at the table to get.
In context The song was written by an obscure composer whom few people had ever heard of, yet once the radio played it, the whole town was humming along.
Similar unclear, vague, little-known, unknown
Opposite clear, famous, well-known
From Latin obscurus, “dark, dim, hidden.”