- whimsical by WordNet
adjectiveDetermined by chance or impulse or whim rather than by necessity or reason.usage: "a...
- capricious by WordNet
adjectiveChangeable.usage: "a capricious summer breeze"; "freakish...
- impulsive by WordNet
adjectiveProceeding from natural feeling or impulse without external stimulus.usage: "an...
- Freakish by Webster's
(a.) Apt to change the mind suddenly; whimsical; capricious.
- Fantastic by Webster's
(a.) Indulging the vagaries of imagination; whimsical; full of absurd fancies; capricious; as,...