Nefarious and Sinister

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

Sinister is a synonym for nefarious. In some cases you can use "Sinister" instead an adjective "Nefarious".

Sinister adjective - Being or showing a sign of evil or calamity to come.

Nefarious is a synonym for sinister in evil topic. Sometimes you can use "Nefarious" instead an adjective "Sinister".