IPA: //mɪˈstɪəriəsnəs//
KK: /mɪˈstɪr.i.əs.nəs/
The quality of being difficult to understand or explain, often creating a sense of intrigue or wonder.
The mysteriousness of the ancient ruins attracted many curious visitors.
Mysteriousness → It is formed from "mysterious" (from Greek "mysterion", meaning secret or hidden) and the suffix "-ness" (meaning the state or quality of). The word "mysteriousness" refers to the quality of being secretive or difficult to understand.
Think of something that is 'secret' or 'hidden' ('mysterion') and how the '-ness' adds the idea of a state or quality. This helps you remember that 'mysteriousness' is the quality of being mysterious.