The word "gelatinated" refers to something that has been turned into gelatin or has the consistency of gelatin. Its antonyms, on the other hand, describe the opposite. Words like solid, firm, hard or rigid all describe something that is not gelatinated. Gelatinated can also mean, to become or make something slippery, or to coat with a gelatin-like substance. Some antonyms for this sense of the word include rough, coarse or gritty. Whatever the context, antonyms for "gelatinated" describe something that is the opposite of soft, slippery, or gel-like in its consistency or texture.