unpredictable

adjectives

not capable of being foretold
unpredictable
is derived from
unpredictability
antonym
predictable
is similar to
dependent on chance
"the aleatory element in life"
aleatory
is similar to
changeable
"a capricious summer breeze"; "freakish weather"
capricious, freakish
is similar to
occurring or appearing at usually irregular intervals
"episodic in his affections"; "occasional headaches"
episodic, occasional
is similar to
incapable of being anticipated
"unforeseeable consequences"
unforeseeable
see also
not certain to occur; not inevitable
"everything is uncertain about the army"; "the issue is uncertain"
uncertain
unknown in advance
"an unpredictable (or indeterminable) future"
unpredictable
is derived from
unpredictability
is similar to
not capable of being definitely decided or ascertained
indeterminable, undeterminable
not occurring at expected times
irregular, unpredictable