Dubious

Dubious:

du·bi·ous

 [doo-bee-uhs, dyoo-]

adjective

1. doubtful. marked by or occasioning doubt. a dubious reply.

2. of uncertain outcome. dubious transaction

 

Precarious

 Precarious:

pre·car·i·ous :

adj \pri-ˈker-ē-əs\

1. depending on the will or pleasure of another.
2. depending on uncertain premises.