labile, a. [L. labilis apt to slip, fr. labi to slip.].
Liable to slip, err, fall, or apostatize. Cheyne. [1913 Webster]
Liable or likely to change. [PJC]
Easily decomposed or inactivated when subjected to heat, radiation, or mildly acidic or alkaline conditions; -- of chemical compounds; as, enzymes from thermophilic organisms are not as labile as those from mesophiles. [PJC]