Being extravagant means spending more than necessary, being wasteful or indulging excessively in luxuries. Its antonyms include frugal, economical, prudent or thrifty. Frugality refers to being careful in spending money and avoiding waste. Economic means using resources efficiently and saving money. Prudent, on the other hand, refers to exercising good judgement and being cautious in spending money. Lastly, being thrifty means using money carefully and wisely, avoiding wastefulness and extravagance. It is important to practice these antonyms in order to avoid financial problems and live within our means. By being frugal, economical, prudent or thrifty, we can save money, build wealth and achieve our financial goals.