Definitions:

1. Excessively proud of one's appearance or achievements. ADJECTIVE
   • He's so vain, always checking himself in the mirror.
2. Producing no results, ineffective or fruitless. ADJECTIVE
   • He died in vain, fighting for a lost cause.
3. Showing undue admiration for oneself; conceited. ADJECTIVE
   • She was too vain to admit she made a mistake.
4. Without success or results, futile or useless. ADJECTIVE
   • All their efforts where in vain.

Synonyms:

• conceited
• egotistical
• fruitless
• futile
• pointless
• self-absorbed
• self-conceited
• unsuccessful

NearBy Words:

• vainglorious
• vainglory
• vainly