Antonyms for the word "over-familiarities" can be categorized as terms that describe distance, respect, and formality. Examples of such antonyms are "reserve," "deference," "decorum," "distance," "respect," and "restraint." These words connote emotional and behavioral boundaries based on societal norms and conventions, which are essential in maintaining professional and courteous relationships. By being mindful of these antonyms, individuals can understand the importance of maintaining proper boundaries and avoid crossing the line, which could lead to uncomfortable and inappropriate situations. This way, one can establish healthy, respectful relationships without crossing the fine line into over-familiarity.