The antonyms for the word "un-appreciated" include recognized, valued, esteemed, prized, esteemed, treasured, respected, acknowledged, and admired. When something or someone is appreciated, it means that they are recognized for their worth, respected, and valued. When these qualities are missing, it can lead to feelings of being overlooked or undervalued. Being appreciated can make all the difference in the world to someone, as it validates their efforts and hard work. Therefore, it is essential to recognize, value, and respect people's efforts and contributions to make this world a better place.