Open English Wordnet
Adjectives
(s)heavy, lumbering, ponderousslow and laborious because of weight“the heavy tread of tired troops”,
“moved with a lumbering sag-bellied trot”,
“ponderous prehistoric beasts”,
“a ponderous yawn” (s)ponderoushaving great mass and weight and unwieldiness“a ponderous stone”,
“a ponderous burden”,
“ponderous weapons” (s)ponderouslabored and dull“a ponderous speech”