capricious, impulsive, whimsical
Meaning: 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"
He had become capricious and fault-finding in conversation.
Blind and capricious impulses hurry us on heedlessly from one thing to another.
The opposites, once more, to thoughtful action are routine and capricious behavior.
In truth, it might, I hoped, die in the dawning, for my lady was as capricious as a May day; but it was love--love as plain as the sun at rising.
Poor Lizzie Greystock!--as men double her own age, and who had known her as a forward, capricious, spoilt child in her father's lifetime, would still call her.
These are not capricious mouthfuls, serving to beguile the boredom of the watch for a brief while; they are substantial repasts, which require several sittings.
A lady to whom a gentleman pays his addresses, is sole mistress of his time and money; and, should he refuse her any request, whether reasonable or capricious, it would reflect eternal dishonor upon him among the men, and make him the detestation of all the women.
I took the trouble this morning to call on the pretended count--if he were a real count he wouldn't be so rich. But, would you believe it, 'He was not receiving.' So the master of Monte Cristo gives himself airs befitting a great millionaire or a capricious beauty.
By the dim light of an accidental lamp, tall, antique, worm-eaten, wooden tenements were seen tottering to their fall, in directions so many and capricious that scarce the semblance of a passage was discernible between them. The paving-stones lay at random, displaced from their beds by the rankly-growing grass.