REFRACTORY (adjective) 1. stubbornly resistant to authority or control; 2. heat-resistant and difficult to melt, bond, or shape; 3. difficult to treat or unresponsive to treatment Synonyms: stubborn, obstinate, intractable, untreatable, hard, heat-resistant Antonyms: docile, obedient, manageable, meltable, treatable ******** VOLUMINOUS (adjective) 1. large and full of volume; 2. extremely lengthy Synonyms: big, abundant, ample, <...>