Impetuous (adjective)

1. Acting or done quickly and without thought or consideration.
2. Characterized by or given to sudden or rash action.
3. Marked by impulsive energy and emotion.

Origin:

From the latin impetuosus (violent, impulsive), from the noun impetu (a violent attack or onset), from impetere (to attack).

Examples:

1. She made an impetuous decision to quit her job without a backup plan.
2. He regretted his impetuous purchase of the sports car.
3. His impetuous behavior caused him to lose his friends and job.
4. The company's impetuous expansion plans led to its downfall.
5. The young prince was known for his impetuous nature and tendency to act on impulse.