A vain endeavor.
An example of vain is a promise that someone doesn't intend to keep.
An example of vain is an attempt to prune a bush only to have it removed the following day.
An example of vain is a person who constantly talks about how good looking they are.
A vain attempt.
- To no avail; without success:Our labor was in vain.
- In an irreverent or disrespectful manner:Took the Lord's name in vain.
- fruitlessly; vainly
- lightly; profanely; irreverently