subject to, led by, or indicative of caprice or whim; erratic

He's such a capricious boss I never know how he'll react.

Obsolete . fanciful or witty.

adjective

constant , dependable , sensible , staid , steadfast , steady

adjective

any way the wind blows , arbitrary , blowing hot and cold , careless , changeful , contrary , crotchety , effervescent , erratic , every which way * , fanciful , fickle , fitful , flaky * , flighty , freakish , gaga , helter-skelter * , humorsome , impulsive , inconstant , kinky * , lubricious , mercurial , moody , mutable , notional , odd , picky * , punchy * , queer , quirky , temperamental , ticklish , unpredictable , unreasonable , unstable , up and down , vagarious , variable , volatile , wayward , whimsical , yo-yo , changeable , fantastic , fantastical , inconsistent , uncertain , unsteady , dizzy , doddy , fluky , iffy , wavering