determined by chance or impulse or whim rather than by necessity or reason; "a capricious refusal"; "authoritarian rulers are frequently capricious"; "the victim of whimsical persecutions"
\kuh-PRISH-us; -PREE-shus\, adjective: Apt to change suddenly; whimsical; changeable
Someone who is capricious often changes their mind unexpectedly. The Union accused Walesa of being capricious and undemocratic. = fickle
subject to, led by, or indicative of a sudden, unpredictable change without apparent or adequate motive
that which is unpredictable, unaccountable, impulsive, or without a supporting rationale, or which is characterized by implied unruly or whimsical behavior See Arbitrary
Impulsive and unpredictable; determined by chance, impulse, or whim; as, a capricious winterstorm, stringent rulers often act capriciously