a.
1.
Weighty ( with reference to one's strength ), ponderous, hard or difficult to lift.
2.
Oppressive, grievous, severe, burdensome, cumbersome, afflictive.
3.
Dull, sluggish, inert, inactive, dilatory, stupid, torpid, indolent, slow, lifeless, inanimate.
4.
Dejected, depressed, sorrowful, sad, gloomy, melancholy, despondent, disconsolate, crushed, cast down, downcast, down-hearted, low-spirited, crestfallen, chapfallen, in low spirits.
5.
Onerous, difficult, laborious, hard.
6.
Tedious, tiresome, wearisome, weary.
7.
Loaded, burdened, encumbered, weighed down.
8.
Miry, muddy, cloggy, clayey.
9.
Clammy ( as bread ), ill-raised, soggy.
10.
Stormy, tempestuous, violent, severe, strong, energetic, boisterous.
11.
Loud, deep, roaring.
12.
Dense, dark, gloomy, lowering, cloudy.
13.
Hard to digest, burdensome, oppressive.
14.
Of great body, strong, heady ( said of liquors ).
15.
Thick, ~-bodied ( said of liquids ).