vain
🇺🇸
/veɪn/
🇬🇧
/veɪn/
useless or without success
He tried in vain to fix the broken toy.
他试图修理那个坏掉的玩具,但徒劳无功。
too proud of how you look or what you can do
She is too vain to admit she needs help.
她太自负了,不肯承认自己需要帮助。