The antonyms for the word "re-unions" are primarily related to separation and isolation. These include words such as partings, separations, breakups, disconnections, and estrangements. While re-unions signify a joyful occasion where friends, family, or colleagues come together after being separated for some time, their antonyms represent a sad and unpleasant experience. These words indicate a sense of loneliness and detachment from the social circle and suggest that individuals haven't met or talked to one another in a long time. Therefore, instead of focusing on the negative connotations of antonyms, it's always better to cherish the delightful moments of re-unions and make them more memorable.