1.Definition: excessively fat

"A weighty man"

Related Adjective(s):corpulent, obese, rotund

2.Definition: having relatively great weight; heavy

"A weighty load", "A weighty package"

3.Definition: of great gravity or crucial import; requiring serious thought

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

Related Adjective(s):grave, grievous, heavy

4.Definition: powerfully persuasive

"A weighty argument"

Related Adjective(s):cogent, telling

5.Definition: weighing heavily on the spirit; causing anxiety or worry

"Weighty problems"