labile

adjective4

1. •
   Apt or likely to change.

   • Pythagoras [said] that each thing or matter was ever gliding and labile. — 1603
2. •
   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.
   • Water ligands typically bind metals in a labile fashion and are rapidly interchanged in aqueous solution.
3. •
   Of a verb, able to change valency without changing its form; especially, able to be used both transitively and intransitively without changing its form.
4. •
   Liable to slip, err, fall, or apostatize.