Definify.com
Webster 1913 Edition
Mysteriousness
Mys-te′ri-ous-ness
,Noun.
1.
The state or quality of being mysterious.
2.
Something mysterious; a mystery.
[R.]
Jer. Taylor.
Webster 1828 Edition
Mysteriousness
MYSTE'RIOUSNESS
,Noun.
1.
Artful perplexity.