1. (a.) Exposed to constant risk; unstable; uncertain; as, a precarious state of health; precarious fortunes\.

2. (a.) Depending on the will or pleasure of another; held by courtesy; liable to be changed or lost at the pleasure of another; as, precarious privileges.

ambiguous borderline chancy critical dangerous delicate desultory dicey difficult doubtful dubious equivocal hairy hazardous iffy indecisive infirm insecure insubstantial on slippery ground on thin ice open perilous problematic provisional questionable risky sensitive shaky shifting shifty slippery slippy temporary tentative ticklish touch-and-go touchy treacherous tricky uncertain undependable unfaithworthy unpredictable unreliable unsettled unsolid unsound unstable unsteadfast unsteady unsubstantial unsure untrustworthy