adjective, weightier, weightiest.
having considerable weight
; heavy; ponderous: a weighty bundle.
burdensome or troublesome: the weightier cares of sovereignty.
important or momentous: weighty negotiations.
having or exerting influence, power, etc.; influential: a weighty merchant of Boston.
significant, serious, grave, consequential. See heavy
1, 3. light. 3. unimportant.