Meaning of the word nefarious in English

What does nefarious mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

nefarious

US /nəˈfer.i.əs/
UK /nəˈfeə.ri.əs/

Adjective

especially of an action or activity) wicked or criminal

Example:
The villain's nefarious plot was foiled by the hero.
He was involved in some nefarious activities.