Vain is an adjective commonly used to describe something that is unsuccessful or without value. It can also refer to a person having an excessively high opinion of their appearance or abilities.
When something is described as vain, it means it has failed or produced no results.
In formal contexts, vain often underscores futile efforts or hopes.
Vain also characterizes someone who is overly proud of their looks or talents.
This usage highlights superficiality and self-importance.
Author's summary:
"Vain" describes both futile attempts at success and undue pride in one's appearance or abilities, emphasizing failure or superficiality with clarity.