precarious

Dangerously lacking in security or stability.

Subject to chance or unknown conditions.

Based on uncertain, unwarranted, or unproved premises.

Dependent on the will or favor of another.

Dependent on the will or pleasure of another; liable to be lost or withdrawn at the will of another; hence, uncertain; insecure.

Specifically, in law, of uncertain tenure; revocable at the will of the owner or creator: as, a precarious right or loan.

Dependent only upon the will of the owner or originator; hence, arbitrary; unfounded.

Dependent upon chance; of doubtful issue; uncertain as to result.

Hence Dangerous; hazardous; exposed to positive peril, risk of misunderstanding, or other hazard.

Depending on the will or pleasure of another; held by courtesy; liable to be changed or lost at the pleasure of another.