1 weighty, ponderous, massive, Literary massy; compact, dense:
This box is much too heavy for me to lift.
2 abundant, overflowing, excessive, copious, profuse, prodigious, ample, unmanageable:
We just crawled along in the heavy traffic.
3 serious, grave, important, crucial, critical, acute:
You always bring up heavy topics at the end of the meeting.
4 burdensome, onerous, oppressive, weighty, unbearable, severe, grievous, distressful, sore, intolerable, insupportable or unsupportable, awful:
Teenagers often feel that they are weighed down with heavy responsibilities.
5 sad, sorrowful, distressing, grievous, upsetting, depressing, gloomy, sombre, melancholy:
Some heavy news has been received from the front.
6 unhappy, miserable, depressed, melancholy, grieving, sad, dejected, downhearted, disconsolate, downcast, despondent, gloomy, heavy-hearted, morose, crestfallen, cheerless:
Heavy at heart, he returned to his cheerless home.
7 ponderous, tedious, monotonous, boring, uninteresting, leaden, dull, prosaic, dry, dry-as-dust, stodgy, staid, stuffy, stifling, stultifying:
The critics found the style much too heavy for the subject being treated
8 thick, coarse, broad, blunt, clumsy, ungraceful:
These heavy brush-strokes prove that the painting is not a Turner.
9 gloomy, cloudy, overcast, bleak, dismal, dreary, leaden, grey, dark, louring or lowering, threatening:
it was another of Scotland's heavy February days.
10 intense, concentrated, severe, forceful, violent, torrential:
The snowfall was the heaviest of the year.
11 overweight, fat, obese, stout, chubby, plump, corpulent, portly, paunchy, tubby, Brit podgy or US pudgy, Colloq beer-bellied:
The doctor did not say I was too heavy, only that I ought to be six inches taller.
12 weighty, difficult, complex, recondite, arcane, deep, profound, esoteric, incomprehensible, impenetrable, unfathomable:
He specializes in some heavy subject like micro-palaeontology.
13 burdened, laden, encumbered, loaded, overloaded, weighed down:
We spied two Indiamen, heavy with cargoes of spices, sailing towards us.