High-stepping horses or elaborately equipped motors waited to carry these ladies into vague metropolitan distances, whence they returned, still more wan from the weight of their sables, to be sucked back into the stifling inertia of the hotel routine.
There are no more uses of "inertia" in the book.
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She had to overcome her inertia and get back to work.
The rocket’s inertia will take it out of the solar system.