Having no real substance, value, or importance; empty; void; worthless; unsatisfying.
- 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.