Fast asleep
Fast asleep adjective - Sleeping deeply.
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Synonyms for Fast asleep
Oblivious and fast asleep are semantically related. In some cases you can replace term "Oblivious" with "Fast asleep", this terms are similar.
Oblivious
Oblivious adjective - Not informed about or aware of something.
Fast asleep and oblivious are semantically related. Sometimes you can replace phrase "Fast asleep" with "Oblivious", this terms are similar.
Nearby Words: oblivion, obliviously
Cite this Source
Oblivious and Fast asleep. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/fast_asleep/oblivious
Fast asleep & Oblivious. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/fast_asleep/oblivious>.
Oblivious or Fast asleep. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/fast_asleep/oblivious.
Google Ngram Viewer shows how "fast asleep" and "oblivious" have occurred on timeline