definition of
precarious

[1] #1 precarious s. [unstable] affording no ease or reassurance; "a precarious truce". wn

[2] #2 precarious s. [parlous, perilous, touch-and-go] 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". wn

[3] #3 precarious s. [shaky] not secure; beset with difficulties; "a shaky marriage". wn