As a noun, meaning excessive pride in one's appearance:
* Her vanity was evident in the hours she spent primping before a night out.
* The actor's vanity led him to believe he was the only one who mattered in the film.
As a noun, meaning a dressing table:
* She kept her jewelry and cosmetics on her vanity.
* He sat at the vanity and began to shave.
As a noun, meaning something of little value:
* His promises were nothing more than vanity - empty words with no substance.
* The pursuit of wealth and status often leads to vanity.
As an adjective, meaning characterized by excessive pride in one's appearance:
* Her vanity gown was covered in sparkling sequins.
* He wore a vanity plate on his car with his initials.
As an adjective, meaning relating to a dressing table:
* She had a beautiful vanity set with a mirror and drawers.
* He purchased a vanity stool to complete his bathroom decor.
Remember: The specific meaning of "vanity" will depend on the context of the sentence.