having or showing excessive pride in one's appearance, abilities, etc; conceited
unsuccessful; ineffectual
in a vain attempt to be amusing
idle; worthless
vain talk
in vain
to no end; without success or result
take somebody's name in vain
to use a name, esp the name of God, profanely or without proper respect
to mention a person by name
vainly adv
vainness noun
[Middle English via French from Latin vanus empty, vain]