unintended
unmotivated
accidental
adventitious
aimless
aleatory
casual
chance
chancy
contingent
designless
destinal
dicey
driftless
dysteleological
fatal
fatidic
fluky
fortuitous
groundless
haphazard
iffy
incidental
indeterminate
indiscriminate
inexplicable
mindless
promiscuous
purposeless
random
risky
stochastic
stray
unaccountable
uncaused
uncreated
undetermined
undirected
unexpected
unforeseeable
unforeseen
unlooked-for
unpredictable
deep-seated
ill-concealed
impotent
inextinguishable
irrational
irreconcilable
needless
pent-up
sectional
senseless
suppress
uncalled-for
uncharacteristic
uncontrollable
ungovernable
unprovoked
unquenchable
unreasoned
unreasoning
unrelenting