How do you use vainer in a sentence?

"Vainer" is not a standard English word. It is likely a misspelling of "vainer," which is the comparative form of "vain."

Here are some examples of how to use "vainer" in a sentence:

* "The more he tried to impress her, the vainer he seemed." (This sentence uses "vainer" to show an increasing level of vanity.)

* "Her attempts to win the competition were becoming increasingly vainer." (This sentence uses "vainer" to describe how the attempts were becoming more and more futile.)

Remember that "vainer" is used to compare levels of vanity or futility, just like "taller," "stronger," or "weaker."