Nefarious and Under-the-counter

Nefarious adjective - Not conforming to a high moral standard; morally unacceptable.

Under-the-counter and nefarious are semantically related In some cases you can use "Under-the-counter" instead an adjective "Nefarious".

Under-the-counter adjective - Done or sold illicitly and secretly;.

Nefarious and under-the-counter are semantically related in against the law topic. Sometimes you can use "Nefarious" instead an adjective phrase "Under-the-counter".