Pre-ordained means determined or intended in advance. The antonyms for pre-ordained are many, and they describe the opposite of predestination or preconception. Antonyms for pre-ordained include chance, randomness, free will, unpredictability, and uncertainty. These words indicate that something is not predetermined, but instead occurs haphazardly or happens as a result of individual choice. Additionally, "spontaneous", "unforeseen", "impromptu," and "unplanned" are all antonyms for pre-ordained, suggesting an ad-hoc or unplanned occurrence rather than a predetermined one. All of these antonyms suggest that predestination is not always the case and that some things happen by chance or at random.