adjective
1.
Synonyms: important 1, big, consequential, considerable, material, meaningful, momentous, significant, substantial
2.
Synonyms: serious 1, earnest, grave, no-nonsense, sedate, sober, sobersided, solemn, somber, staid
3.
Synonyms: serious 2, grave, heavy, severe
4.
Synonyms: heavy 1, cumbersome, cumbrous, hefty, massive, ponderous
Antonyms: weightless
5.
Synonyms: fat 2, corpulent, fleshy, gross, heavy, obese, overweight, porcine, portly, stout
6.
Synonyms: onerous , burdensome, demanding, exacting, exigent, grievous, oppressive, superincumbent, taxing, tough