adj. 25B6; adjective
a whimsical sense of humour : FANCIFUL, playful, mischievous, waggish, quaint, curious, droll; eccentric, quirky, idiosyncratic, unconventional, outlandish, queer; informal offbeat, freaky.
the whimsical arbitrariness of autocracy : VOLATILE, capricious, fickle, changeable, unpredictable, variable, erratic, mercurial, mutable, inconstant, inconsistent, unstable, protean.