"ponderous" in the adjective sense
1. 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"
2. ponderous
having great mass and weight and unwieldiness
"a ponderous stone"
"a ponderous burden"
"ponderous weapons"
3. ponderous
labored and dull
"a ponderous speech"
Source: WordNet® (An amazing lexical database of English)
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