Little-known and So-and-so

Little-known adjective - Unknown to most people.

So-and-so and little-known are semantically related. In some cases you can use "So-and-so" instead an adjective phrase "Little-known".

So-and-so noun - A person whose behavior is offensive to others.

Little-known and so-and-so are semantically related. Sometimes you can replace phrase "Little-known" with "So-and-so", this phrases are similar.