False
False adverb - In a disloyal and faithless manner.
Usage example: his wife played him false
Treacherously is a synonym for false. In some cases you can use "Treacherously" instead an adverb "False".
Treacherously
Treacherously adverb - In a disloyal and faithless manner.
Usage example: he behaved treacherously
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Synonyms for Treacherously
Nearby Words: treacherous, treachery
Both words in one sentence
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Averted when the Time Bandit takes an actual shortcut through the treacherously narrow and shallow False Pass — at night and with Johnathan's son Scotty at the helm no less.Andy: (paraphrased) The lives of the men, the safety of the boat, and that season's profits are all in [Scotty's] hands.
Source: Series / Deadliest Catch
Cite this Source
Treacherously and False. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/false/treacherously
False & Treacherously. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/false/treacherously>.
Treacherously or False. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/false/treacherously.
Google Ngram Viewer shows how "false" and "treacherously" have occurred on timeline