having or showing an excessively high opinion of one's appearance, abilities, or worth.
their flattery made him vain
同义词：
conceitednarcissisticself-lovingin love with oneselfself-admiringself-regardingwrapped up in oneselfself-absorbedself-obsessedself-centeredegotisticegotisticalegoisticegocentricegomaniacproudhaughtyarrogantboastfulswaggeringimperiousoverweeningcockyaffectedhave an excessively high opinion of oneselfthink too highly of oneselfthink a lot of oneselfrare：peacockishliterary：vaingloriousinformal：think one is the cat's whiskers/pajamasthink one is God's gift (to women)
2
producing no result; useless.
a vain attempt to tidy up the room
同义词：
futileuselesspointlessworthlessnugatoryto no purposein vainineffectiveineffectualinefficaciousimpotentpowerlessunavailingto no availfruitlessprofitlessunproductiveunsuccessfulfailedwithout successabortivemisfiredthwartedbalkedfrustratedfoiledarchaic：bootless
