Non-convergence refers to the failure of two or more elements to meet at a point or a common ground. There are various synonyms for non-convergence, including "divergence", which points at a separation of paths or opinions. "Incompatibility" describes the lack of congruence or harmony between two or more things. "Disparity" suggests an imbalance or discrepancy between two sets of data, while "discordance" reflects on a lack of agreement or harmony in a situation. "Incongruity" highlights a lack of proper fit or congruence between elements. Finally, "non-uniformity" describes the lack of evenness or consistency in a series of data or parameters.