Definitions:

1. Boastful in a showy or self-important way. ADJECTIVE
   • His vainglorious speeches alienated even his closest supporters.
2. Excessively proud of one's own achievements, appearance, or abilities. ADJECTIVE
   • She made a vainglorious display of her awards and tittles.
3. Feeling self-importance. ADJECTIVE
   • The vainglorious athlete boasted about his every accomplishment, seeking constant praise.

Synonyms:

• arrogant
• Boastful
• conceited
• egotistical
• pompous
• self-important