relentlessness
noun/ɹɪˈlɛntləsnəs/
Etymology From relentless + -ness.
1
The condition of being relentless.
- The more I learned about transkids, the more I grilled you, every day. I'm ashamed of my relentlessness, but I had to know. “Why do you want to be a boy?” “I don't know.”2012, Rachel Pepper, Transitions of the Heart: