Affectless is a term that describes someone who appears unemotional, unfeeling, and indifferent to the world around them. Some antonyms for affectless might include passionate, expressive, animated, lively, or enthusiastic. Affectless describes a lack of emotion, so words that imply strong emotions are perfect antonyms. Vibrant, exuberant, and exultant are also excellent antonyms for affectless. Conversely, apathetic, impassive, and dispassionate are three other synonyms for affectless that also have opposite meanings. Together, these antonyms paint a more comprehensive picture of what it means to have emotions, and how we can use language to convey these feelings.