The antonyms for the word "more predeterminate" are "less certain" or "unclear." When something is "more predeterminate," it means it is already established or known beforehand. On the other hand, "less certain" means there is less reliability or assurance in the outcome, while "unclear" means things are muddled or uncertain. These words' antonyms convey different degrees of information or precision in a situation, from being completely clear to being completely unsure. Adversely, if there is "more predeterminate" information, then it could be more certain, and one could rely on it more confidently.