खलनायक
khalanayak
A villain is a bad person in a story, like a character who causes trouble or does bad things.
You say 'villain' like this: vil-lin.
The word 'villain' comes from an old word that meant a farm worker or a person from a village, but over time it changed to mean a bad person in stories.
The word 'villain' in Hindi is 'खलनायक' (Khalanāyak).