Synonyms|48Antonyms|18|Broader|11Narrower|17Related|86

4 entries under informal topic. ×

17
nighty-night(expression, slang, wish, interjection)
14
night night(expression, wish, interjection)
1
nite nite(expression, interjection, british)
1
sleep fast(expression, wish, interjection)
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APASmart Define. (2011). sleep tight thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/sleep_tight/thesaurus/synonyms
ChicagoSmart Define. 2011. "sleep tight thesaurus" https://smartdefine.org/sleep_tight/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2011, sleep tight thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/sleep_tight/thesaurus/synonyms>.
MLASmart Define. "sleep tight thesaurus" 6 May 2011. Web. 29 September 2026. <https://smartdefine.org/sleep_tight/thesaurus/synonyms>