1. Exhibiting self-importance
   - boastful, braggart, bragging, braggy, big, crowing, self-aggrandizing, self-aggrandising [Brit] 
2. Full of high-spirited delight
   - elated, gleeful, joyful, jubilant, on top of the world

See also: joyous, proud

• second string
• second thought
• second to none
• second trimester
• Second Vatican Council
• second wind
• Second World War
• second-degree burn
• second-guess
• second-hand speech
• second-hand store
• second-in-command
• second-place finish
• second-rate
• second-rater
• second-sighted
• second-stringer
• second-year
• secondarily
• secondary
• secondary amenorrhea
• secondary cell
• secondary censorship
• secondary coil
• secondary dentition