in line 19 inertness most nearly means lifelessness
inertness (typically uncountable, multiple inertnesses) (usually uncountable, plural inertnesses) Lack of effort; a propensity for motion or movement that is habitual Synonyms include laziness, insensibility, and apathy. lack of self-motional ability.
A substance's inertness is its ability to be non-reactive. When it doesn't react with another substance, a substance is said to be inert in chemistry. Inert gases include, for instance, noble gases like neon and helium.
lifelessness is the state of not appearing to be alive or not being alive. The skin is speckled yellow and lifeless, seeming plasticky. a lack of enthusiasm or energy: The therapy can help with gloom and lifelessness. synonyms of lifeless include immobility and stillness.
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