Ominous
Ominous adjective - Being or showing a sign of evil or calamity to come.
Treacherous and ominous are semantically related In some cases you can use "Treacherous" instead an adjective "Ominous".
Nearby Word: ominously
Treacherous
Treacherous adjective - Not true in one's allegiance to someone or something.
Ominous and treacherous are semantically related in dangerous topic. Sometimes you can use "Ominous" instead an adjective "Treacherous".
Nearby Words: treachery, treacherously
Mutual synonyms
Both words in one sentence
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Treacherous Mansion has an ominous woodwinds and strings melody to evoke a lurking danger.
Cite this Source
Treacherous and Ominous. (2016). Retrieved 2026, August 09, from https://thesaurus.plus/related/ominous/treacherous
Ominous & Treacherous. N.p., 2016. Web. 09 Aug. 2026. <https://thesaurus.plus/related/ominous/treacherous>.
Treacherous or Ominous. 2016. Accessed August 09, 2026. https://thesaurus.plus/related/ominous/treacherous.
Google Ngram Viewer shows how "ominous" and "treacherous" have occurred on timeline