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" ;