The antonyms for the word "was thrifty" are "was careless," "was extravagant," and "was wasteful." Being thrifty means being careful and economical with money or resources, while being careless is the opposite of that, implying a lack of concern for financial matters. Extravagant, on the other hand, is the tendency to spend excessively, beyond what is necessary, while being wasteful means squandering resources without any thought or consideration. In general, antonyms for "was thrifty" imply the lack of discipline, responsibility, and caution in managing money or resources. Thus, it is important to be aware of these antonyms to avoid financial problems and maximize the use of resources.