Is saying "May God guide him" or "May God amend So-and-so" about someone in their absence, as an expression of disapproval of their actions, a form of backbiting?

If what you say in speech is disliked by the person and causes them distress if they hear or are told of it, then it is forbidden backbiting (gheebah). This is the act of mentioning a person with something they dislike in their absence, whether verbally, in writing, or by संकेत. The criterion for backbiting is anything that implies a نقص in a Muslim. Examples include mimicry or mentioning specific individuals with the intention of disparaging them. Backbiting also includes alluding to a person, even if their name is not explicitly mentioned, if the listener understands the intention, such as saying, "We ask Allah for well-being" or "May Allah guide us," with the intent of referring to a specific person's shortcoming.