(a.) Having or manifesting an exaggerated idea of one's own importance or merit.

arrogant assured big big-league big-name big-time bigwig bigwigged bloated bombastic cocksure complacent conceited confident consequential considerable convinced decided determined double-barreled earthshaking egotistical flatulent formal gassy grand grandiloquent great haughty heavyweight high-powered hubristic important inflated magisterial major material momentous name narcissan narcissine narcissistic narcistic overbearing overconfident overproud oversure overweening persuaded poised pompous pontifical positive presumptuous proud puffy reassured secure self-absorbed self-admiring self-approving self-assuming self-assured self-complacent self-confident self-congratulating self-congratulatory self-content self-contented self-delighting self-endeared self-esteeming self-gratulating self-gratulatory self-loving self-reliant self-respecting self-satisfied self-seeking self-sufficient significant smug snobbish snooty snotty solemn stilted stuck-up stuffy substantial superior sure swollen tumid turgid unafraid undoubting unfaltering unhesitating unwavering vain vainglorious world-shaking