Synonyms: 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: dangerous, unsafe
Definition: involving or causing danger or risk; liable to hurt or harm
Usage: a dangerous criminal; a dangerous bridge; unemployment reached dangerous proportions