unchangeable not changeable or subject to change; "a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life"
inconstant likely to change frequently often without apparent or cogent reason; variable; "inconstant affections"; "an inconstant lover"; "swear not by...the inconstant moon"- Shakespeare
changeability,
changeableness the quality of being changeable; having a marked tendency to change; "the changeableness of the weather"
adjustable capable of being regulated; "adjustable interest rates"
checkered marked by changeable fortune; "a checkered business career"
distortable capable of having the meaning altered or twisted; "our words are distortable things--as in a crooked mirror held up to nature"
quicksilver,
fickle,
erratic,
mercurial marked by erratic changeableness in affections or attachments; "fickle friends"; "a flirt's volatile affections"
fluid,
unstable subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup"
fluid,
mobile subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup"