of import vs weighty

of import and weighty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
of import	No	Yes	No	No
weighty	No	Yes	No	No

of import (adjective)	weighty (adjective)
of great significance or value	having relatively great weight; heavy
	excessively fat
	weighing heavily on the spirit; causing anxiety or worry
	of great gravity or crucial import; requiring serious thought
	powerfully persuasive