Indigo and Royal blue

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Indigo adjective - Having a color between blue and violet.

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Royal blue and indigo are semantically related. In some cases you can use "Royal blue" instead an adjective "Indigo".

Royal blue noun - A shade of blue tinged with purple.

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Indigo and royal blue are semantically related. You can use "Indigo" instead an adjective phrase "Royal blue".

This could also be the trait of a particularly anal-retentive character who always has to be right, the trait extending so far that the character always has to use exactly the right word — never using "blue" when "azure" or "indigo" or even "royal blue" would be more accurate, for example.

Source: Sesquipedalian Loquaciousness

Cite this Source

Royal blue and Indigo. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/indigo/royal_blue

Indigo & Royal blue. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/indigo/royal_blue>.

Royal blue or Indigo. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/indigo/royal_blue.

Google Ngram Viewer shows how "indigo" and "royal blue" have occurred on timeline