flagitious vs grievous

flagitious and grievous both are adjectives.

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

As adjectives, flagitious and grievous are synonyms defined as:

Other synonyms of flagitious include atrocious, monstrous.

flagitious (adjective)	grievous (adjective)
shockingly brutal or cruel	causing fear or anxiety by threatening great harm
extremely wicked, deeply criminal	shockingly brutal or cruel
	of great gravity or crucial import; requiring serious thought
	causing or marked by grief or anguish