Improvident (adjective)

1. Not providing for or thinking about future needs or events; not showing foresight.
2. Not taking care of or managing resources or finances wisely.

Origin:

Late 18th century: from french imprudent or latin improvident- "not looking ahead", from in- "not" + provident- "providing".

Examples:

1. His improvident spending habits put him into debt.
2. The improvident use of resources led to the company's downfall.
3. His improvident nature was a source of worry to his family.
4. The improvident planning for the event resulted in a lack of chairs.
5. The improvident management of the company's finances led to its bankruptcy.