guaranteed Synonyms

made sure vouch vouched unfailing unexceptionable undisputable underwrote sworn swore suretyship sure stipulated secured secure reliable vowed warrant safeguarded ensured sponsored unhazardous tried and true sure-fire in the bag on ice foolproof confirmed well-tried fail-safe objectified warranted proved promised decided covered countersigned clear certified certificated certain bonded bailed attested assure assured ascertained affirmed definite dependable promise