"Ex probating" is not a widely-known term and therefore, it does not have direct antonyms. However, the word "probate" has several antonyms, such as "disprove" which means to prove something to be false or incorrect, "invalidate" means to make something null or void, "refute" means to prove a statement or theory to be incorrect, and "contradict" means to deny the truth of a statement or allegation by asserting the opposite. These words are commonly used in legal settings to challenge the validity of a will or legal document. While "ex probating" may not have direct antonyms, its counterpart "probating" has several opposites that can convey a similar meaning in a legal context.