1540s, back-formation from vituperation, or else from Latin vituperatus, past participle of vituperare. "Not in common use until the beginning of the 19th c." [OED]. Related: Vituperated; vituperating.
word-forming element making adjectives from verbs, meaning "pertaining to, tending to; doing, serving to do," in some cases from Old French -if, but usually directly from Latin adjectival suffix -ivus (source also of Italian and Spanish -ivo). In some words borrowed from French at an early date it has been reduced to -y (as in hasty, tardy).
<a href="https://www.etymonline.com/word/vituperative">Etymology of vituperative by etymonline</a>
Harper, D. (n.d.). Etymology of vituperative. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/vituperative