The prefix "an-" carries the meaning of negation or absence, and there are several synonyms that can be used in its place. Words such as "non-", "un-", "dis-", and "in-" can all serve as substitutes for "an-". For instance, instead of saying "anabolic", one could say "non-anabolic" to convey the opposite effect. Similarly, "anxiety" could be expressed as "unrest" or "disquietude". In medical terms, "anemia" can be rephrased as "iron-deficiency" or "low-blood count". Utilizing various synonyms for "an-" can help to add variety and depth to your writing while still conveying the intended meaning.