1The complexity of human nature is a mysterious ness that has puzzled philosophers for centuries.
2Is the concept of happiness a measurable ness or just a feeling?
3Her kindness and generosity are qualities that define her gentle ness.
4The team's success was due to their ability to work together in harmony, a ness that is hard to achieve.
5The professor's lecture explored the abstract ness of time and its relationship to human perception.