labile

a. [ L. labilis apt to slip, fr. labi to slip. ] 1. Liable to slip, err, fall, or apostatize. [ Obs. ] Cheyne. [ 1913 Webster ]

2. Liable or likely to change. [ PJC ]

3. (Chem.) 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 ]