1. (superl.) Having weight; heavy; ponderous; as, a weighty body.

2. (superl.) Adapted to turn the balance in the mind, or to convince; important; forcible; serious; momentous.

3. (superl.) Rigorous; severe; afflictive.

Gargantuan absolute adducible admissible amplitudinous ascendant astronomical attestative attestive authentic authoritarian authoritative authorized autocratic awe-inspiring awesome based on big binding boundless bulky burdensome certain charismatic charming circumstantial clothed with authority cogent colossal commanding competent conclusive consequential considerable consistent controlling convincing corpulent cosmic cumbersome cumbrous cumulative damning decisive decorous demanding demure determinative dignified documentary documented dominant duly constituted earnest effective effectual efficacious elevated eminent empowered enchanting enormous estimable evidential evidentiary ex officio ex parte exacting exhausting exigent extensive eye-witness factual fat fatal fateful final firsthand fleshy formal formidable founded on frowning galactic gigantic good governing grand grave great grievous grim grim-faced grim-visaged grinding gross grounded on harsh hearsay heavy heavyweight hefty hegemonic hegemonistic huge immeasurable immense imperative implicit important imposing incontrovertible indicative indisputable infinite influential inspiring irrefutable irresistible just king-size large lawful leaden leading legal legitimate lofty logical long-faced magnetic majestic mammoth massive massy material meaningful mighty momentous monocratic monster monstrous monumental mountainous moving no-nonsense noble nuncupative obese official onerous oppressive outsize overburdensome overgrown overweight overwhelming personable persuasive ponderous portentous portly potent powerful preeminent prestigious presumptive probative prodigious prominent puissant ranking reliable reputable ruling sedate self-consistent senior serious severe significant sizable sober sober-minded sobersided solemn solid somber sound spacious staid stately stone-faced stout straight-faced strong stupendous suasive sublime substantial sufficient suggestive superincumbent superior supreme sure symptomatic taxing telling thoughtful titanic totalitarian tough tremendous tyrannous unsmiling valid vast voluminous wearing wearying well-founded well-grounded winning