Precarious

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.

Thesaurus Entries

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