unpredictable (adjective) unpredictable: changeable
Sinonime: capricious,
chance, chancy, dicey,
doubtful,
erratic,
fickle, fluctuating, fluky, from left field, hanging by a thread, iffy, incalculable, inconstant,
random, touch and go,
touchy,
uncertain, unforeseeable,
unreliable,
unstable, up for grabs,
variable,
whimsicalAntonime: constant,
predictable,
unchanging, unvarying