The term "possessed oneself of" indicates the act of acquiring or taking control of something. Its antonyms are words that represent the opposite of such actions. The antonyms for "possessed oneself of" may include words such as relinquish, release, surrender, give up, abandon, let go, relinquishment, and dispersion, among others. These words emphasize the idea of giving or losing control rather than obtaining it. Therefore, when used in context, the antonyms for "possessed oneself of" can add depth and nuance to a sentence, highlighting the act of letting go or relinquishing, rather than acquiring or grasping.