Illegal
Illegal adjective - Contrary to or forbidden by law.
Treacherous and illegal are semantically related. In some cases you can use "Treacherous" instead an adjective "Illegal".
Nearby Words: illegality, illegally
Treacherous
Treacherous adjective - Not true in one's allegiance to someone or something.
Illegal and treacherous are semantically related. Sometimes you can use "Illegal" instead an adjective "Treacherous".
Nearby Words: treachery, treacherously
Mutual synonyms
Related pairs
- base and illegal
- base and treacherous
- corrupt and illegal
- corrupt and treacherous
- dirty and illegal
- dirty and treacherous
- dishonest and illegal
- dishonest and treacherous
- unscrupulous and illegal
- unscrupulous and treacherous
- crooked and illegal
- crooked and treacherous
- fraudulent and illegal
- fraudulent and treacherous
Both words in one sentence
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Idril, during the Fall of Gondolin, as her treacherous cousin Maeglin, who is in love with her despite first-cousin marriages being illegal among Elves, tries to take her (it is implied he intends to basically rape her) and murder her son Earendil.
Source: Damsel in Distress
Cite this Source
Treacherous and Illegal. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/illegal/treacherous
Illegal & Treacherous. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/illegal/treacherous>.
Treacherous or Illegal. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/illegal/treacherous.
Google Ngram Viewer shows how "illegal" and "treacherous" have occurred on timeline