CALUMNIATE, verb transitive [See Calumny.] To accuse or charge one falsely, and knowingly, with some crime, offense, or something, disreputable; to slander. CALUMNIATE, verb intransitive To charge falsely and knowingly with a crime or offense; to propagate evil reports with a design to injure the reputation of another.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI