- inscrutableness
- nimpenetrability, impenetrableness, incomprehensibility, incomprehensibleness, inscrutability; poker face, dead pan, sphinx, Mona Lisa smile; mysteriousness, mystery, inexplicability, inex-plicableness, unexplainableness, insolvability, insolubility, insolubleness; darkness, obscurity, obscureness, dimness, vagueness, nebulousness; uncertainty, ambiguity; unfathomableness, unknowableness, unknowability, indecipherability, indecipherableness; impassivity, unexpressiveness, expressionlessness.
A Note on the Style of the synonym finder. 2014.