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
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."