arrogant, assured, believing, certain, cocksure, confident, decided, determined, devout, dogmatic, doubtless, faithful, fideistic, hubristic, impressed with, overconfident, oversure, overweening, persuaded, pietistic, pious, pistic, poised, pompous, positive, proud, reassured, satisfied, secure, self-assured, self-confident, self-important, self-reliant, sold on, sure, unafraid, under the impression, undoubtful, undoubting, unfaltering, unhesitating, unwavering