The word sphinxlike is often used to describe someone who is mysterious, inscrutable and enigmatic. However, if you are looking for synonyms for the word 'more sphinxlike', there are several alternatives to consider. Some of the most suitable options include cryptic, enigmatic, impenetrable, inscrutable, opaque, and unfathomable. These adjectives are used to describe people or things that are difficult to understand or interpret. Other synonyms for more sphinxlike include mysterious, obscure, secret, and enigmatical. Regardless of the adjective used, they all refer to something that is difficult to decipher or unravel, like the enigmatic riddle posed by the legendary Sphinx of ancient Egypt.