grievous vs dangerous

grievous and dangerous both are adjectives.

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

As adjectives, grievous and dangerous are synonyms defined as:

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

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

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