Definition of weighty
(adj)
having
relatively great weight; heavy; "a weighty load"; "a weighty package"
powerfully persuasive; "a cogent argument"; "a
telling presentation"; "a weighty argument"
of
great gravity or
crucial import; requiring
serious thought; "grave responsibilities"; "faced a
grave decision in a
time of crisis"; "a grievous fault"; "heavy matters of state"; "the weighty matters to be discussed at the
peace conference"