noun. The quality of being mysterious; obscurity; the quality of being hidden from the understanding and calculated to excite curiosity or wonder.

noun. That which is mysterious or obscure.

noun. The behavior or manner of one who wishes or affects to imply a mystery: as, he told us with much mysteriousness to wait and see.

noun. The state or quality of being mysterious.

noun. Something mysterious; a mystery.

noun. The quality of being mysterious.

"The mysteriousness is the point, what makes it koan-like."

Harding  abstruseness  betrothment  conspicuousness  crepitus  

mystery