adjective

of great weight; difficult to lift or move.

a heavy and bulky load

weighty,hefty,big,large,substantial,massive,ponderous,solid,dense,leaden,burdensome,hulking,weighing a ton,overweight,bulky,stout,stocky,portly,plump,paunchy,fleshy,fat,obese,corpulent,of ample build,ample,well upholstered,well padded,broad in the beam,Falstaffian,tubby,beefy,porky,pudgy,blubbery,poddy,podgy,pursy

noun

a thing, such as a vehicle, that is large or heavy of its kind.

adverb

heavily.

heavy-laden