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She was so vain about her intelligence that she dismissed others' opinions as inferior to her own.
She was so vain that she spent hours in front of the mirror, obsessing over her appearance.
Despite his lack of talent, he was vain enough to believe he was the best singer in the group.
He was so vain about his physical appearance that he refused to leave the house without perfect grooming.
The actress's vain behavior made it difficult for her co-stars to work with her.
