<p><strong>Noun</strong></p><ul><li>excessive or unnecessary expenditure or outlay of money.</li><li>Antonyms: frugality</li><li>an instance of this: That sports car is an inexcusable extravagance.</li><li>unrestrained or fantastic excess, as of actions or opinions.</li><li>Synonyms: lavishness, profusion</li><li>an extravagant action, notion, etc.: the extravagances one commits in moments of stress.</li></ul>