weighty
[adjective]
Synonyms:
- important, consequential, crucial, grave, momentous, portentous, serious, significant, solemn
- heavy, burdensome, cumbersome, hefty (informal), massive, ponderous

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Antonyms: weightless

[TahlilGaran] English Synonym Dictionary ▲

weight‧y /ˈweɪti/ adjective
[Word Family: adjective: overweight ≠ underweight, weighted, weighty, weightless; verb: weigh, outweigh, weight; noun: weight, weights, weighting]

1. important and serious:
She didn’t feel like discussing weighty matters.

2. literary heavy:
a weighty tome (=a big and heavy book)

[TahlilGaran] Dictionary of Contemporary English ▲