Illegal
Illegal adjective - Contrary to or forbidden by law.
Questionable and illegal are semantically related. In some cases you can use "Questionable" instead an adjective "Illegal".
Nearby Words: illegality, illegally
Questionable
Questionable adjective - Giving good reason for being doubted, questioned, or challenged.
Illegal and questionable are semantically related. Sometimes you can use "Illegal" instead an adjective "Questionable".
Both words in one sentence
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Dirty Cop: Darren uses some questionable methods while he is investigating the murder of Alison although he doesn't do anything that is actually illegal.
Source: Series / Pretty Little Liars -
He's a protagonist and easy to sympathize with, but he does a lot of stuff that's ethically questionable (legally speaking, it's not questionable, it's flat out illegal).
Source: Amoral Attorney - She does, which transforms what would otherwise be treason into a convoluted police sting, which is questionable but not illegal.
Source: Moral Event Horizon / Fan Works
Cite this Source
Questionable and Illegal. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/illegal/questionable
Illegal & Questionable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/illegal/questionable>.
Questionable or Illegal. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/illegal/questionable.
Google Ngram Viewer shows how "illegal" and "questionable" have occurred on timeline