Antonyms for the phrase "is economical with" include extravagant, wasteful, profligate, spendthrift, and lavish. Being economical means being careful and judicious with resources, including time, money, and energy. Therefore, antonyms for being economical involve the excessive or careless use of these resources. For instance, someone who is extravagant spends recklessly, disregards budgeting, and indulges in unnecessary luxuries. On the other hand, a spendthrift person squanders money, time, or other resources without considering their worth or potential drawbacks. While being economical with resources is generally considered a positive trait, its antonyms reflect the negative consequences of overindulgence or neglect.