Definition of "Weighty" :

adjective: excessively fat

"A weighty man."

adjective: having relatively great weight; heavy

"A weighty load."

adjective: weighing heavily on the spirit; causing anxiety or worry

"Weighty problems."

adjective: of great gravity or crucial import; requiring serious thought

"The weighty matters to be discussed at the peace conference."

adjective: powerfully persuasive

"A weighty argument."