Definition of weighty

• 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"