Illegally
Illegally adverb - In an illegal manner.
Undercover and illegally are semantically related. In some cases you can use "Undercover" instead an adverb "Illegally".
Nearby Words: illegal, illegality
Undercover
Undercover adjective - Undertaken or done so as to escape being observed or known by others.
Illegally and undercover are semantically related. Sometimes you can use "Illegally" instead an adverb "Undercover".
Mutual synonyms
Both words in one sentence
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Fraser is undercover as a patient in a mental hospital and comes across evidence that the staff are illegally testing an anti-depressant that causes some of the subjects to commit suicide.
Source: Have You Told Anyone Else? -
The MacGyver episode "Log Jam" involves MacGyver going undercover in a logging company in the Pacific Northwest, whose owners are being forced by Yakuza gangsters to illegally log protected forest land so they can sell the logs for outrageous profit back in Japan.
Source: Yakuza
Cite this Source
Undercover and Illegally. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/illegally/undercover
Illegally & Undercover. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/illegally/undercover>.
Undercover or Illegally. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/illegally/undercover.
Google Ngram Viewer shows how "illegally" and "undercover" have occurred on timeline