"mutable" in the adjective sense
1. mutable, changeable
capable of or tending to change in form or quality or nature
"a mutable substance"
"mutable weather patterns"
"a mutable foreign policy"
2. mutable
prone to frequent change inconstant
"the fickle and mutable nature of truth"
"the mutable ways of fortune"
3. mutable
tending to undergo genetic mutuation
"It is likely, too, that the chromosomes of all eubacteria are as mutable as that of E. coli"
Source: WordNet® (An amazing lexical database of English)
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