say it: PER-uh-luhs
perilous is an adjective meaning "fraught with danger". It is pronounced /ˈpɛɹələs/ — PER-uh-luhs. It carries one recorded sense.
fraught with danger
“dangerous waters”
“a parlous journey on stormy seas”
“a perilous voyage across the Atlantic in a small boat”
“the precarious life of an undersea diver”
“dangerous surgery followed by a touch-and-go recovery”
Definitions, synonyms and semantic relations for perilous come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.