pre·car·i·ous
[pri-kair-ee-uh s]
–adjective
1.dependent on circumstances beyond one’s control; uncertain; unstable; insecure: a precarious livelihood.
2.dependent on the will or pleasure of another; liable to be withdrawn or lost at the will of another: He held a precarious tenure under an arbitrary administration.
3.exposed to or involving danger; dangerous; perilous; risky: the precarious life of an underseas diver.
4.having insufficient, little, or no foundation: a precarious assumption.