Ponderous

[H]e saw, at the end of a shallow embrasure, a ponderous door of dark wood, braced with iron.

It was Dryden's opinion . . . that the drama required an alternation of comick and tragick scenes; and that it is necessary to mitigate, by alleviations of merriment, the pressure of ponderous events, and the fatigue of toilsome passions.

[T]he inmates of the coach, by numerous hard, painful joltings, and ponderous, dragging trundlings, are suddenly made sensible of some great change in the character of the road.