labile

adjective

1. 1

   Liable to slip, err, fall, or apostatize.

2. 2

   Apt or likely to change.

3. 3

   (of a compound or bond) Kinetically unstable; rapidly cleaved (and possibly reformed).

   “Certain drugs can be conjugated to polymer molecules with a linkage that is labile at low pH to effect controlled release in a cellular endosome.”

4. 4

   (of a verb) Able to change valency without changing its form; especially, able to be used both transitively and intransitively without changing its form.