Synonyms For "Heavy" :
1 syllable:
big, dense, fat, grave, great, hard, harsh, large, sound
2 syllables:
clayey, cloggy, cloudy, compact, doughy, enceinte, fleshy, gravid, grievous, gruelling, hefty, labored, laboured, leaden, massive, profound, soggy, sullen, taxing, threatening, toilsome, troubling, wakeless, weighted, weighty, with child
3 syllables:
arduous, backbreaking, burdensome, distressful, distressing, disturbing, expectant, grueling, heavily, lowering, lumbering, onerous, operose, oppressive, overweight, perturbing, ponderous, punishing, sonorous, worrisome, worrying