← BackshareGuessperilous/ˈpɛrələs/adjectiveFull of danger or risk; hazardous.The knight embarked on a perilous quest to rescue the princess.The mountain climbers faced a perilous journey across a narrow ice ridge.Driving through the flooded streets was a perilous decision.SynonymsdangeroustreacheroushazardousriskyAntonymssafesecure