From Longman Dictionary of Up to date Englishvainvain /veɪn/ â—â—‹â—‹ adjective   1 PROUDsomeone that is vain is simply too proud of their very good seems to be, skills, or situation – utilized to exhibit disapproval SYN conceited  Adult males might be just as vain as women.â–º see thesaurus at proud2 →