Whim

Amy impulsively adopted a rescue puppy on a whim, adding joy to her life.

The child's sudden whim to jump in the puddle caught his parents off guard.

Emily rearranged her furniture on a whim, creating a whole new look for her living room.

Jake's purchase of a motorcycle was a whim, and he rarely rode it.

The decision to adopt a pet was not based on careful consideration but on a whim.

The child asked for an ice cream cone on a whim.