The art of being frugal is an important skill to have in today's world, but there are times when being lavish is necessary. Some antonyms for the word 'art frugal' could be wasteful, extravagant, lavish, indulgent, and spendthrift. Being wasteful means using more resources than needed, while extravagance refers to the excessive use of money or materials. Indulging in luxuries can also be the opposite of being frugal, and spendthrift means someone who spends money carelessly without considering the consequences. While being frugal has many benefits, occasionally treating oneself to something lavish can also be a rewarding experience.