Pre-figured means to have planned or anticipated beforehand. Antonyms for pre-figured include words such as spontaneous, unanticipated, unexpected, and impromptu. Spontaneous means something that is done on the spur of the moment, without any prior planning. Unanticipated refers to something that occurs without any forewarning, without being expected or predicted. Unexpected means something that is surprising, unforeseen, or totally unforeseen. Finally, impromptu refers to something that is done without any advance preparation, rehearsal, or planning. These words are all antonyms for pre-figured, as they highlight the lack of pre-planning and spontaneity of an action.