Synonyms of boastful

1 Syllable
vain, big
2 Syllables
strutting, swanky, crowing, pompous, stuck-up, snooty, fustian, triumphant, loudmouth, vaunting, windbag, cocky
3 Syllables
exultant, peacocky, vainglorious, glittery, pretentious, self-seeking, self-serving, big-headed, swellheaded, bombastic, puffed-up, swaggering, arrogant, conceited, know-it-all
4 Syllables
egotistic, highfalutin, smart-alecky, swollen-headed, self-respecting, ostentatious, magniloquent, self-involved, self-admiring, dismissive, hifalutin, self-applauding, prizewinning
5 Syllables
egotistical, celebratory, grandiloquence, self-aggrandizing, magniloquence
6 Syllables
exhibitionistic