The opposite of "un demanded" is "demanded." If something is demanded, it means that someone has requested, required or commanded it. Demanded refers to something that is asked for with authority, urgency or insistence. It implies that the thing being demanded is necessary, important or essential. On the other hand, if something is "un demanded," it means that it has not been requested, required or commanded. In other words, it is something that is not necessary, important or essential. Examples of antonyms for "un demanded" would be demanded, required, crucial, necessary, and needed.