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

• altitude sickness
• altitudinal
• altitudinous
• alto
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• altocumulus
• altocumulus cloud
• altogether
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• Alton Glenn Miller
• Altoona
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• altostratus cloud
• altricial
• altruism
• altruist
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• alula
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• alum
• alumbloom