Pa leans above the bed in the twilight, his humped silhouette partaking of that owl-like quality of awry-feathered, disgruntled outrage within which lurks a wisdom too profound or too inert for even thought.
The wagon is hauled clear, the wheels chocked (carefully: we all helped; it is as though upon the shabby, familiar, inert shape of the wagon there lingered somehow, latent yet still immediate, that violence which had slain the mules that drew it not an hour since) above the edge of the flood.
There are no more uses of "inert" in the book.
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The snake had recently eaten and lay inert in the grass.