What is a sentence using the word passiveness?

Answer 1

(The correct term is "passivity", but modern colloquial English finds ways to make nouns from adjectives, and even verbs from nouns, with little regard for formal use.)

"We were puzzled by his passiveness in the face of the school's actions."

"Passiveness is sometimes a symptom of laziness, or apathy, or simply resignation that nothing effective can be done."