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Webster's Dictionary (1865)

Weight'y, a.

adjective

(wāt’ÿ), a. [compar. WEIGHTIER; superl. WEIGHTIEST.]

  1. Having weight; heavy; ponderous; as, a weighty body.
  2. Hence, important; forcible; momentous; adapted to turn the balance in the mind, or to convince. “Weighty reasons.” Shak.

Let me have your advice in a weighty affair. Swift. 3. Rigorous; severe. [Rare.] “Our weightier judgment.” Shak. Syn.—Heavy; ponderous; burdensome; onerous; forcible; momentous; efficacious.