noun

a quantity of soft material that fills or is used to fill something.

duvets with synthetic fillings

stuffing,padding,wadding,filler,quilting,cushioning,lining,packing

adjective

(of food) leaving one with a pleasantly satiated feeling.

the full English breakfast was delicious and also very filling

substantial,hearty,ample,abundant,solid,nutritious,nourishing,satisfying,square,heavy,starchy,leaden,stodgy