Adjectives

(a)mutable, changeablecapable of or tending to change in form or quality or nature“a mutable substance”, “mutable weather patterns”, “a mutable foreign policy”
(s)mutableprone to frequent change; inconstant“the fickle and mutable nature of truth”, “the mutable ways of fortune”
(s)mutabletending to undergo genetic mutation“It is likely, too, that the chromosomes of all eubacteria are as mutable as that of E. coli”