Apostasize refers to the act of abandoning or renouncing a religious, political, or ideological belief. Some of its synonyms include disavow, forsake, reject, abjure, repudiate, or renounce. Disavow means to deny any association or responsibility with something. Forsake means to abandon or leave something behind. Reject means to refuse or dismiss something. Abjure means to reject or renounce a belief or opinion. Repudiate means to disown or reject something publicly. Renounce means to formally give up or abandon something. All these synonyms share a common meaning of letting go of something, whether it is a belief, opinion, or affiliation.