Double-dealing and Nefarious

Double-dealing adjective - Marked by, based on, or done by the use of dishonest methods to acquire something of value.

Nefarious and double-dealing are semantically related. In some cases you can use "Nefarious" instead an adjective phrase "Double-dealing".

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

Double-dealing and nefarious are semantically related. Sometimes you can use "Double-dealing" instead an adjective "Nefarious".