The word "inexpressible" refers to something that cannot be put into words or adequately described. Its antonyms, on the other hand, are words that express a clear and well-defined meaning, including expressible, comprehensible, understandable, definitive, articulate, lucid, and clear-cut. By using these antonyms, we can easily convey our message or communicate our thoughts and feelings precisely. Whether we are describing a beautiful sunset or trying to express our deepest emotions, using the right antonyms can help us effectively convey our intended meaning and create a clearer understanding between ourselves and others.