ponderous

(s) 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
lumbering, heavy,
(s) having great mass and weight and unwieldiness
- a ponderous stone
- a ponderous burden
- ponderous weapons
(s) labored and dull
- a ponderous speech

lumbering heavy

ponderosa

ponderously ponderousness