vain: meaning and definitions

Not yielding the desired outcome; fruitless: a vain attempt.

Lacking substance or worth: vain talk.

Excessively proud of one's appearance or accomplishments; conceited.

Archaic Foolish.

in vain To no avail; without success: Our labor was in vain.

in vain In an irreverent or disrespectful manner: took the Lord's name in vain.