dangerous vs grievous

dangerous and grievous both are adjectives.

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

As adjectives, dangerous and grievous are synonyms defined as:

dangerous and grievous: causing fear or anxiety by threatening great harm

Other synonyms of dangerous include grave, life-threatening, serious, severe.

dangerous (adjective)	grievous (adjective)
involving or causing danger or risk; liable to hurt or harm	causing fear or anxiety by threatening great harm
causing fear or anxiety by threatening great harm	shockingly brutal or cruel
	of great gravity or crucial import; requiring serious thought
	causing or marked by grief or anguish