ponderous (
http://definr.com/ponderous)
adj 1: 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" [syn:
heavy,
lumbering]
2: having great mass and weight and unwieldiness; "a ponderous
stone"; "a ponderous burden"; "ponderous weapons"
3: labored and dull; "a ponderous speech"