The phrase "anybody at all" can be replaced with a few different synonyms such as "anyone whatsoever", "any person whatsoever", "whoever", and "whomever". These phrases emphasize the idea that anyone, regardless of who they are, is being considered. The phrase "anybody at all" can also be replaced with a more specific term depending on the context. For example, if looking for a specific person, you might use "someone", "a particular individual", or even their name. Using synonyms can help vary your language and make your writing more dynamic.