weighty Synonyms

cogent heavy grave obese grievous impressive rotund ponderous momentous onerous telling corpulent burdensome relevant recondite unsmiling serious severe po-faced significant solid sounder punishing profound porcine portentous portly potent powerful wakeless substantial sobersided pregnant pressing staid stodgy unbearable urgent valid vital worrisome influential well-grounded well-founded hippo backbreaking unwieldy trying tough stressful