Imprudence (noun)

1. The state or quality of being imprudent; the state or quality of lacking caution or good judgement.
2. The state or quality of being reckless or thoughtless; the state or quality of acting without due consideration.

Origin:

Late 16th century: from french imprudence or latin imprudentia, from imprudent- "not looking ahead", from in- "not" + prudent- "providing".

Examples:

1. His imprudence led to his financial ruin.
2. Her imprudence in driving resulted in a car accident.
3. The imprudence of the plan was apparent to everyone.
4. His imprudence in managing the company's finances led to its downfall.
5. The imprudence of the decision was obvious in retrospect.