grievous vs critical

grievous and critical both are adjectives.

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

grievous (adjective)	critical (adjective)
causing fear or anxiety by threatening great harm	marked by a tendency to find and call attention to errors and flaws
shockingly brutal or cruel	characterized by careful evaluation and judgment
of great gravity or crucial import; requiring serious thought	being in or verging on a state of crisis or emergency
causing or marked by grief or anguish	at or of a point at which a property or phenomenon suffers an abrupt change especially having enough mass to sustain a chain reaction
	of or involving or characteristic of critics or criticism
	forming or having the nature of a turning point or crisis
	urgently needed; absolutely necessary