Sinecures are jobs that pay a lot of money but don't require much work.
Sinecures are usually seen as unfair because people get paid a lot for not doing much.
Examples:
The mayor's job is a sinecure - he gets paid a lot but doesn't do much.
She has a sinecure at the company - she gets paid a lot for doing almost nothing.
The company's president has a sinecure - he doesn't work much but gets paid a lot.
Having a sinecure sounds nice - getting paid a lot for not doing anything!
Some people think that being a celebrity is a sinecure - they get paid a lot for just being famous.
A sinecure is like winning the lottery - getting a lot of money for not working much.