The word "un dear" can be defined as something that is not considered valuable or costly. Its antonyms, on the other hand, are words that express the opposite meaning. Some of the antonyms for "un dear" are precious, valuable, expensive, priceless, cherished, treasured, and costly. These words indicate that the item in question is considered to be of high value or importance. For example, a diamond ring would be considered precious, valuable, and expensive, while a toy car would be considered "un dear." By understanding antonyms for words like "un dear," we can better understand language and communicate more effectively.