The term "more spendthrift" refers to a person who spends money extravagantly and recklessly. However, there are several antonyms for this term, which means a person who is the exact opposite. The first antonym is "frugal," which refers to a person who is thrifty and avoids unnecessary expenses. Another antonym for "more spendthrift" is "thrifty," which refers to a person who is careful and economical with money. A third antonym for "more spendthrift" is "prudent," which refers to a person who is wise and cautious with money. Finally, the term "conservative" can also be used as an antonym for "more spendthrift," which describes a person who saves money and avoids excess spending.