- heavy, lumbering, ponderous - slow and laborious because of weight; "the heavy tread of tired troops"; "moved with a lumbering sag-bellied trot"; "ponderous prehistoric beasts"; "a ponderous yawn"
Antonym: light-footed (indirect, via heavy-footed)
- ponderous - having great mass and weight and unwieldiness; "a ponderous stone"; "a ponderous burden"; "ponderous weapons"
Antonym: light (indirect, via heavy)
- ponderous - labored and dull; "a ponderous speech"
Antonym: interesting (indirect, via uninteresting)