(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."
I am not writing a sentence using that word.
Some word family members for "passive" include passivity, passively, passiveness, and passivize.
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avoidance,inaction,inactivity,inertia,latency,passiveness, and/orstillness
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Yes, a sentence can be made using the word "subaquatic". An example in a sentence of the word in the sentence "a marginal subaquatic flora".
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