Definition of in vain
: without success : without producing a good or desired result <We searched in vain for the missing earring.> <He tried in vain to get the baby to sleep.>
Word by Word Definitions
: having no real value : idle, worthless
: marked by futility or ineffectualness : unsuccessful, useless
: foolish, silly
Seen and Heard
What made you want to look up in vain? Please tell us where you read or heard it (including the quote, if possible).