Demarked refers to the act of marking or setting boundaries or limits. Antonyms for demarked would be words that describe actions that blur, remove or ignore boundaries. Words that can be used as antonyms for demarked include "merge," "combine," "mix," "integrate," "unite," "fuse," "disperse," "scatter," "dissolve," "eliminate," "erase," "abolish," and "annul." While demarked implies a clear and defined border, its antonyms suggest movement towards unification or destruction of boundaries. It is important to understand the opposing meanings of words in order to use them effectively in communication.