Illegal and Valid

Opposite meaning words

Illegal adjective - Contrary to or forbidden by law.

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Valid is an antonym for illegal.

Nearby Words: illegality, illegally

Valid adjective - According to the rules of logic.

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Illegal is an antonym for valid in right topic.

Nearby Words: validity, validation

This resulted in illegal moves not being rejected, but the computer asking the user to confirm whether he was playing a valid word.

Source: Scrabble Babble
At the Nuremberg trials, it was established that "just following orders" is a valid defense, but only below the rank of lieutenant, and only if the orders in question are not clearly illegal.

Source: Just Following Orders
He found an obscure law that proved that the officer who arrested them didn't have valid grounds to pull them over, and since all further evidence was taken from a technically illegal police stop, it was inadmissible in court.

Source: Off on a Technicality

Cite this Source

Valid and Illegal. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/illegal/valid

Illegal & Valid. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/illegal/valid>.

Valid or Illegal. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/illegal/valid.

Google Ngram Viewer shows how "illegal" and "valid" have occurred on timeline