The word "reconciliating" means to restore a friendly relationship between two parties. The antonym of "reconciliating" is "estranging," which means to alienate or push someone away. Another antonym is "dividing," which indicates splitting two parties apart. "Disagreeing" can also be used as an antonym for "reconciliating" as it suggests that both parties can't reach consensus. Lastly, "offending" can imply angering or upsetting one or both parties, resulting in a sense of hostility between them. Therefore, if we need to indicate the opposite of reconciliation, we can use any of these antonyms that indicate animosity or detachment between two parties.