weighty

Etymology

From Middle English weighti, weghti, wighti, equivalent to weight + -y. Cognate with Scots weichty, wechty, wichty, Saterland Frisian wichtich, West Frisian wichtich, Dutch wichtig, gewichtig, German wichtig, Danish vigtig, Swedish viktig.

adj

1. Heavy (“having a lot of weight”).
   And so a weighty rock she aimed / With much enthusiasm 1898, Guy Wetmore Carryl, The Confiding Peasant and the Maladroit Bear
   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. (figurative) Important; serious; not trivial or petty.
   a weighty argument
3. Rigorous; severe; afflictive.