Definition of "fast asleep" [fast asleep]

• Sleeping, in a deep sleep (adjective)

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• "In the evening, after he had been carried home at midnight, fast asleep in his father's arms, he would dream in a babel of languages about exquisite girls and the smell of moisturising face-cream."
• "Exhausted by exertion and anxiety, I was fast asleep within half-an-hour after stepping up the junk's side."
• "It is excusable, for she had a hard life of it: but still it was dangerous; for when Mrs. Poole was fast asleep after the gin and water, the mad lady, who was as cunning as a witch, would take the keys out of her pocket, let herself out of her chamber, and go roaming about the house, doing any wild mischief that came into her head."