Demarks, meaning to mark or distinguish a boundary or limit, has several antonyms that convey the opposite meaning. Undemarks, ambiguous, unclear or indeterminate, signifies the absence of a clear boundary or limit. Blurs, fuses or mixes are also antonyms of demarks, as they mean to combine or blend without any clear boundaries or marks. Other antonyms of demarks include merge, meld, integrate, and homogenize, which suggest the combination of different elements, rather than their separation or distinction. In essence, the antonyms of demarks all denote the lack of a clear separation or differentiation, highlighting the importance of marking and delineating boundaries.