weighty Copy link Outline I. HeavyII. Cogent, forcible1. grăvis, e2. firmus • weighty: I. Heavy: v. heavy. II. Cogent, forcible: 1. grăvis, e: most w. causes, gravissimae causae, Cic. Fam. 5, 12, 7: w. sentences, sententiae g., Cic. Brut. 95, 325. 2. firmus: w. precepts of duty, officii praecepta firma, Cic. Off. 1, 2, 6: v. forcible.