perilous vs precarious

perilous and precarious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
perilous	No	Yes	No	No
precarious	No	Yes	No	No

As adjectives, perilous and precarious are synonyms defined as:

Other synonyms of perilous include parlous, touch-and-go.

perilous (adjective)	precarious (adjective)
fraught with danger	fraught with danger
	not secure; beset with difficulties
	affording no ease or reassurance