Not well-known and Offbeat

Offbeat and not well-known are semantically related. in not on the usual path topic. In some cases you can use "Offbeat" instead an adjective phrase "Not well-known".

Offbeat adjective - Different from the ordinary in a way that causes curiosity or suspicion.

Not well-known and offbeat are semantically related. You can use "Not well-known" instead an adjective "Offbeat".