The antonyms for the phrase "confessing all" are many, but they can be broadly classified into two categories: withholding and denying. When someone withholds information, they keep it hidden or refrain from sharing it, while denying is a deliberate refusal to admit something happened or that one was involved. Some words that could be used as antonyms for confessing all include concealing, withholding, hiding, obscuring, obscuring, denying, refuting, negating, disavowing, and in some cases, lying. In some situations, it may be appropriate to withhold information, but generally, it is preferable to be honest and open rather than withholding or denying information.