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adjective
heavy
Synonyms: burdensome, cumbersome, cumbrous, dense, fat, fleshy, hefty, massive, obese, overweight, ponderous, porcine, portly, stout
Antonyms: light, small, thin, unsubstantial
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adjective
serious, important
Synonyms: big, big deal, consequential, considerable, critical, crucial, earnest, forcible, grave, heavy, heavyweight, life and death, material, meaningful, momentous, no-nonsense, portentous, sedate, severe, significant, sober, solemn, somber, staid, substantial, underlined
Antonyms: inconsequential, trivial, unimportant, unsubstantial
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adjective
troublesome, difficult
Synonyms: backbreaking, burdensome, crushing, demanding, exacting, exigent, grievous, onerous, oppressive, superincumbent, taxing, tough, worrisome, worrying
Antonyms: easy, facile, solvable