There are many synonyms that can be used to describe the word "was wasteful." Some of these include extravagant, prodigal, excessive, lavish, and profligate. Being wasteful refers to using more than what is needed or wasting resources, and these synonyms reflect that meaning. An extravagant person spends money recklessly, while a prodigal person is lavish and wasteful in their spending. Excessive and profligate both refer to using or spending more than what is necessary or appropriate. It's important to use these synonyms effectively in writing to accurately convey the idea of being wasteful.