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“To tell the truth”—he sank his face into his thin, white hands—“I have felt helpless. I have felt like one of those poor rabbits when the snake is writhing towards it. I seem to be in the grasp of some resistless, inexorable evil, which no foresight and no precautions can guard against.”

Which of the following is nearest in meaning to the word “inexorable” in the excerpt above?

dreadful
impossible to stop
inflexible
combative