"Refractory juice" refers to a liquid that is difficult to digest or process. Some synonyms for this term include "unyielding liquid," "stubborn extract," "resistant broth," and "reluctant elixir." These phrases all imply a substance that is hard to break down, either due to its chemical composition or physical properties. Other possible synonyms could include words like "tough," "uncooperative," or "unmanageable." Overall, the term "refractory juice" is useful for describing any liquid that presents a challenge to the digestive system or other forms of processing, and there are many different neologisms that could be used to convey this same idea.