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heavy 
1 bulky, hefty, massive, ponderous, portly, weighty 
2 burdensome, difficult, grievous, hard, harsh, intolerable, laborious, onerous, oppressive, severe, tedious, vexatious, wearisome 
3 apathetic, drowsy, dull, inactive, indolent, inert, listless, slow, sluggish, stupid, torpid, wooden 
4 crestfallen, dejected, depressed, despondent, disconsolate, downcast, gloomy, grieving, melancholy, sad, sorrowful 
5 complex, deep, difficult, grave, profound, serious, solemn, weighty 
6 abundant, considerable, copious, excessive, large, profuse 
7 burdened, encumbered, laden, loaded, oppressed, weighted 
8 boisterous, rough, stormy, tempestuous, turbulent, violent, wild 
9 dull, gloomy, leaden, louring  or  lowering, overcast 
1 agile, compact, handy, light, slight, small 
2 bearable, easy, light, mild, moderate 
3 agile, alert, brisk, quick 
4 calm, cheerful, happy, joyful 
5 exciting, inconsequential, trivial, unimportant 
6 light, moderate, slight, sparse 
8 gentle, mild, moderate, soft, weak