perilous

/ˈper-ə-ləs/

Middle English perilous, perelous, borrowed from Anglo-French perilleus, perillous, going back to Latin perīculōsus, from perīculum "test, risk, " + -ōsus -ous

adjective

  1. full of or involving peril

a perilous journey

dangerous hazardous precarious perilous risky mean bringing or involving the chance of loss or injury. dangerous applies to something that may cause harm or loss unless dealt with carefully. hazardous implies great and continuous risk of harm or failure.

noun

  1. a seat at King Arthur's Round Table reserved for the knight destined to achieve the quest of the Holy Grail and fatal to any other occupying it