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3 definitions found
 for weighty
From The Collaborative International Dictionary of English v.0.48 :

  Weighty \Weight"y\, a. [Compar. Weightier; superl.
     [1913 Webster]
     1. Having weight; heavy; ponderous; as, a weighty body.
        [1913 Webster]
     2. Adapted to turn the balance in the mind, or to convince;
        important; forcible; serious; momentous. "For sundry
        weighty reasons." --Shak.
        [1913 Webster]
              Let me have your advice in a weighty affair.
        [1913 Webster]
     3. Rigorous; severe; afflictive. [R.] "Attend our weightier
        judgment." --Shak.
        [1913 Webster]
     Syn: Heavy; ponderous; burdensome; onerous; forcible;
          momentous; efficacious; impressive; cogent.
          [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adj 1: having relatively great weight; heavy; "a weighty load";
             "a weighty package" [ant: weightless]
      2: powerfully persuasive; "a cogent argument"; "a telling
         presentation"; "a weighty argument" [syn: cogent,
         telling, weighty]
      3: of great gravity or crucial import; requiring serious
         thought; "grave responsibilities"; "faced a grave decision in
         a time of crisis"; "a grievous fault"; "heavy matters of
         state"; "the weighty matters to be discussed at the peace
         conference" [syn: grave, grievous, heavy, weighty]
      4: weighing heavily on the spirit; causing anxiety or worry;
         "weighty problems"
      5: excessively fat; "a weighty man" [syn: corpulent, obese,
         weighty, rotund]

From Moby Thesaurus II by Grady Ward, 1.0 :

  224 Moby Thesaurus words for "weighty":
     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

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