Pre-possessed means already possessing something, and hence its antonyms refer to the absence of ownership or influence. Unimpressed, unbiased, disinterested, and neutral are possible antonyms. Unprejudiced, nonpartisan, and unprepossessing are also antonyms for pre-possessed. Noncommittal, objective, and unconvinced are other options for antonyms of pre-possessed. These terms can be used in phrases like "I tried to remain nonpartisan" or "I found myself unconvinced by his arguments." Overall, pre-possessed and its antonyms reflect the concept of possession or the lack thereof, and how it can affect a person's viewpoint.