Usually means: Deeply sleeping, unaware of surroundings.
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We found 9 dictionaries that define the word fast asleep:

General (9 matching dictionaries)
  1. fast asleep: Vocabulary.com
  2. fast asleep: Wiktionary
  3. fast asleep: Dictionary.com
  4. fast asleep: FreeDictionary.org
  5. fast asleep: Mnemonic Dictionary
  6. fast asleep: TheFreeDictionary.com
  7. fast asleep: Longman Dictionary of Contemporary English

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Definitions from Wiktionary (fast asleep)

▸ adjective:  (idiomatic) Sleeping, in a deep sleep.

Similar:
sound asleep, asleep, dead asleep, sleeping, comatose, aslumber, down for the count, sound, sacked out, sleepbound, more...

Opposite:
awake, alert, conscious, wide awake, not asleep

▸ Words similar to fast asleep

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▸ Popular nouns described by fast asleep

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▸ Rhymes of fast asleep

▸ Invented words related to fast asleep

Similar:
sound asleep, asleep, dead asleep, sleeping, comatose, aslumber, down for the count, sound, sacked out, sleepbound, more...

Opposite:
awake, alert, conscious, wide awake, not asleep



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