1. The state or quality of being mysterious 
2. Something mysterious; a mystery

Derived forms: mysteriousnesses

• apocalypse
• apocalyptic
• apocalyptical
• apocarpous
• apocenter
• apocentre
• apochromatic
• apocope
• apocrine
• apocrine gland
• Apocrypha
• apocryphal
• apocryphally
• Apocynaceae
• apocynaceous
• Apocynum
• Apocynum androsaemifolium
• Apocynum cannabinum
• Apocynum pumilum
• apodal
• apodeictic
• apodeme
• Apodemus
• Apodemus sylvaticus
• apodictic