Most emotionable refers to something that is highly emotional or excites strong feelings. The opposite of this would be something that is unemotional or lacking in emotion. Antonyms for most emotionable could include words such as detached, indifferent, apathetic, unfeeling, or aloof. These words express a lack of emotion or feeling, and are the opposite of something that is highly emotional. Other antonyms could include cool, calm, collected, stoic, or monotone, which suggest a sense of calmness or composure in the face of strong emotions. The right antonym for most emotionable would depend on the context in which it is used.