weighty vs grievous

weighty and grievous both are adjectives.

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

As adjectives, weighty and grievous are synonyms defined as:

weighty and grievous: of great gravity or crucial import; requiring serious thought

Other synonyms of weighty include grave, heavy.

weighty (adjective)	grievous (adjective)
having relatively great weight; heavy	causing fear or anxiety by threatening great harm
excessively fat	shockingly brutal or cruel
weighing heavily on the spirit; causing anxiety or worry	of great gravity or crucial import; requiring serious thought
of great gravity or crucial import; requiring serious thought	causing or marked by grief or anguish
powerfully persuasive