weighty vs rotund

weighty and rotund both are adjectives.

Word	Noun	Adjective	Verb	Adverb
weighty	No	Yes	No	No
rotund	No	Yes	No	No

As adjectives, weighty and rotund are synonyms defined as:

Other synonyms of weighty include corpulent, obese.

weighty (adjective)	rotund (adjective)
having relatively great weight; heavy	excessively fat
excessively fat	(of sounds) full and rich
weighing heavily on the spirit; causing anxiety or worry	spherical in shape
of great gravity or crucial import; requiring serious thought
powerfully persuasive