The word "most belonging" refers to something that possesses the highest degree of ownership or attachment. Its antonyms, on the other hand, would describe something without any sense of belonging or ownership. For instance, "lone" means being alone or independent, "unfamiliar" means unknown or strange, "alien" means foreign or different, "estranged" means being separated or disowned, and "detached" means uninvolved or impartial. These antonyms indicate a lack of emotional attachment, and in some cases, a sense of separation or distance from others. By understanding these antonyms, we can better appreciate the value of belonging and the importance of social connections in our lives.