weighty

comparative weightier · superlative weightiest · alternative obsolete weightie

1. Having a lot of weight; heavy.

   And so a weighty rock she aimed / With much enthusiasm

   1898, Guy Wetmore Carryl, The Confiding Peasant and the Maladroit Bear

   1 more example

   To fund the purchase, he had to sell a late Renoir, The Judgment of Paris, with its depiction of weighty ladies frolicking in a roseate garden.

   2018, Thom Nickels, Philadelphia Mansions: Stories and Characters behind the Walls

2. figurativelyImportant; serious; not trivial or petty.

   a weighty argument

   1 more example

   But I have now reached a point in the progress of my narrative, when it becomes necessary to turn away from these light descriptions, to the more grave and weighty matter of the second battle with Master Tibeats, and the flight through the great Pacoudrie Swamp.

   1853, Solomon Northup, chapter IX, in [David Wilson], editor, Twelve Years a Slave. […], London: Sampson Low, Son & Co.; Auburn, N.Y.: Derby and Miller, →OCLC, page 130

   Synonyms: grave, solemn, austere, frightful, demure, serious, grave, earnest

3. Rigorous; severe; afflictive.