Definition of vain
2 : marked by futility or ineffectualness : unsuccessful, useless vain efforts to escape
in vain
1 : to no end : without success or result
her efforts were in vain
2 : in an irreverent or blasphemous manner
you shall not take the name of the Lord your God in vain — Deuteronomy 5:11 (Revised Standard Version)
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Time Traveler for vain
The first known use of vain was in the 14th century
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