You can call someone willing to take financial risks in new ventures entrepreneurial. Caught up in the entrepreneurial spirit, you felt like a modern-day pioneer braving the wild frontier of business. Then you ran out of lemonade.
Entrepreneurial is the adjective form of the noun "entrepreneur," someone investing in risky financial situations. The base noun can be traced to the Latin prendere, "to take," and the 19th Century French entrepreneur, "one who undertakes or manages." It often involves a risky undertaking, however, including the possibility of losing everything. The 19th-Century English Physicist Michael Faraday once broke it down this way: “The five essential entrepreneurial skills for success are concentration, discrimination, organization, innovation and communication.”