The word "un-wasteful" describes someone or something that is not wasteful, or that practices conservation and efficiency. Antonyms for "un-wasteful" include words that describe wastefulness, extravagance, or inefficiency. Examples of antonyms might include words like profligate, prodigal, excessive, or lavish. These words describe people or things that use resources in a careless, thoughtless, or extravagant way, without regard for the consequences. By understanding the antonyms of "un-wasteful," we can better appreciate the value of conservation and smart resource management, and work to reduce waste and promote sustainability in our everyday lives.