rotund vs weighty

rotund and weighty both are adjectives.

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

As adjectives, rotund and weighty are synonyms defined as:

Other synonyms of rotund include corpulent, obese.

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