The phrase 'inky darkness' is often used to describe the darkest of nights or the blackest of shadows. Synonyms for this phrase can include terms such as pitch-black, jet-black, or ebony. Other related words could include tenebrous, murky, or shadowy. Additional synonyms for inky darkness could also be gloomy, dim, or obscure. Each term carries its own connotation, and which you choose to use may depend on the context in which it is being used. By using a synonym for inky darkness, you can add depth to your writing and create a more vivid and descriptive landscape for your reader to imagine.