The phrase "more finer" is grammatically incorrect as it uses two comparatives together. However, if we look at the individual words, their antonyms could be "less" and "coarser" respectively. "Less" means a smaller amount or quantity, whereas "coarser" refers to something that is rough or not fine. In terms of context, if we say "less finer," we mean that something is not as fine as we expected or previously experienced. Conversely, if we say "more coarser," we mean that something has become rougher or less refined. It is essential to use correct grammar and precise vocabulary to communicate effectively.