Dictionary
precarious |priˈke(ə)rēəs|
adjective
1 not securely held or in position; dangerously likely to fall or collapse : a precarious ladder.
2 dependent on chance; uncertain : she made a precarious living by writing.
DERIVATIVES
precariously adverb
precariousness noun
ORIGIN mid 17th cent.: from Latin precarius ‘obtained by entreaty’ (from prex, prec- ‘prayer’ ) + -ous .

Thesaurus
precarious
adjective
those steps look a bit precarious uncertain, insecure, unpredictable, risky, parlous, hazardous, dangerous, unsafe; unsettled, unstable, unsteady, shaky; informal dicey, chancy, iffy. antonym safe.