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vain
01
taking great pride in one's abilities, appearance, etc.
02
not producing any successful outcome
Example
The actress's vain behavior made it difficult for her co-stars to work with her.
She was so vain about her intelligence that she dismissed others' opinions as inferior to her own.
Despite his lack of talent, he was vain enough to believe he was the best singer in the group.
She was so vain that she spent hours in front of the mirror, obsessing over her appearance.
He was so vain about his physical appearance that he refused to leave the house without perfect grooming.
