lightning storm (noun) electrical storm: thunderstorm
Sinonime: accidentally on purpose,
arbitrary,
contrary, double-crossing,
evil,
gratuitous, groundless,
inconsiderate,
malevolent,
mean,
merciless, motiveless,
needless,
ornery,
perverse,
senseless,
spiteful, unasked, uncalled-for,
unfair,
unjust, unjustifiable, unjustified, unprovoked,
vicious, wayward,
wicked, willful
Antonime: gentle,
kind,
nice