What is the meaning of fast asleep?

adjective

  • Sleeping deeply.
    • usage: "lying fast asleep on the sofa"; "it would be cruel to wake him; he's sound asleep"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). fast asleep. Retrieved September 20, 2026, from http://smartdefine.org/fast_asleep/definitions/1173945
ChicagoWordNet. 2010. "fast asleep" http://smartdefine.org/fast_asleep/definitions/1173945 (accessed September 20, 2026).
HarvardWordNet 2010, fast asleep, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/fast_asleep/definitions/1173945>.
MLAWordNet. "fast asleep" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/fast_asleep/definitions/1173945>