Sphinxlike is a descriptive word that brings to mind the enigmatic and inscrutable nature associated with the mythical creature from which it takes its name. While it is a powerful and evocative word, it can at times feel overused or cliched. To mix up your language and keep your writing fresh and interesting, there are a number of synonyms for sphinxlike that can convey a similar meaning. Some alternatives might include words like aloof, inscrutable, mysterious, enigmatic, cryptic, elusive, secretive, or unfathomable. Each of these words has a slightly different connotation, so it's worth considering which one best suits the tone and purpose of your writing.