Impassionate is a word that describes someone who lacks emotion or enthusiasm. There are several synonyms that can be used in place of impassionate, depending on the context. Some examples of synonyms include apathetic, unemotional, indifferent, dispassionate, cold, and stoic. These words describe a lack of passion or emotion, but they each carry their own connotations and shades of meaning. For example, while dispassionate and impassionate are similar in meaning, dispassionate implies a calm, rational approach to a situation, whereas impassionate suggests a complete absence of emotion. Overall, these synonyms are useful for describing someone who is aloof or detached from their surroundings.