Synonyms for the word "un-receptivenesses" are numerous and varied, but all convey the same general idea of resistance, opposition, or lack of openness. Some possible synonyms include aloofness, coldness, indifference, insensitivity, apathy, callousness, and detachment. Other alternatives might include stubbornness, recalcitrance, defiance, obstinance, or rigidity. In any case, when someone exhibits an attitude of un-receptiveness, they put up barriers to communication, understanding, and cooperation that make it difficult or impossible to connect with them in a meaningful way. As a result, it is important to try to identify what underlying issues or motivations might be driving this behavior and find effective ways to address them constructively.