Madcap (adjective)

1. Wildly or recklessly impulsive, unpredictable and carefree.
2. Acting in a wild and impulsive way, foolhardy.

Origin:

The word madcap comes from the phrase "mad cap" which means a person who acts in a wild or reckless manner. it has been in use since the 16th century. .

Examples:

1. He had a reputation for being a madcap, always getting into trouble and doing crazy things.
2. She had a madcap sense of humor, always joking and making people laugh.
3. His madcap ideas often got him into trouble, but he never seemed to learn from his mistakes.
4. She had a madcap energy that was infectious, always making people feel alive and excited.
5. The young prince's madcap antics often worried his parents, but he always managed to land on his feet.