Rubberiness is a term used to describe the texture or consistency of something that is rubbery, malleable or resilient. The antonyms for this word would be words that describe the opposite of the characteristics of rubberiness, such as stiffness, rigidity, inflexibility, or brittleness. For instance, if rubberiness is associated with food, the antonyms could be words like crunchiness, hardness, or firmness. On the other hand, if rubberiness is associated with texture, antonyms such as coarseness or roughness could be applicable. Ultimately, the antonyms for rubberiness would depend on the context in which the word is used.