Not yielding the desired outcome; fruitless: a vain attempt.

What vain really is,a someone who cares alot about themselves, has a mirror in hand at any given time. Cares alot about looks, always in style, usually come from a well off family with loads of money to spend on stupid brand name clothing, gucci hats and $400 shoes...Can be a girl or boy. People ...

Someone who is vain is too proud of their good looks, abilities, or position – used to show disapproval SYN conceited.