Synonyms: dangerous, grave, grievous, life-threatening, serious, severe
Definition: causing fear or anxiety by threatening great harm
Usage: a dangerous operation; a grave situation; a grave illness; grievous bodily harm; a serious wound; a serious turn of events; a severe case of pneumonia; a life-threatening disease
Similar words: critical
Definition: being in or verging on a state of crisis or emergency
Usage: a critical shortage of food; a critical illness; an illness at the critical stage
Definition: involving or causing danger or risk; liable to hurt or harm
Usage: a dangerous criminal; a dangerous bridge; unemployment reached dangerous proportions
Similar words: breakneck
Definition: moving at very high speed
Usage: a breakneck pace
Similar words: chanceful, chancy, dodgy, dicey
Definition: of uncertain outcome; especially fraught with risk
Usage: an extremely dicey future on a brave new world of liquid nitrogen, tar, and smog- New Yorker
Similar words: desperate
Definition: (of persons) dangerously reckless or violent as from urgency or despair
Usage: a desperate criminal; taken hostage of desperate men
Similar words: wild, risky, hazardous
Definition: involving risk or danger
Usage: skydiving is a hazardous sport; extremely risky going out in the tide and fog; a wild financial scheme
Similar words: insidious
Definition: intended to entrap
Similar words: mordacious
Definition: biting or given to biting
Usage: they deliberately gave me a skittish and mordacious mount
Similar words: on the hook
Definition: caught in a difficult or dangerous situation
Usage: there I was back on the hook
Similar words: perilous, parlous, precarious, touch-and-go
Definition: fraught with danger
Usage: 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
Similar words: suicidal, self-destructive
Definition: dangerous to yourself or your interests
Usage: suicidal impulses; a suicidal corporate takeover strategy; a kamikaze pilot
Similar words: treacherous, unreliable
Definition: dangerously unstable and unpredictable
Usage: treacherous winding roads; an unreliable trestle