Colourless
Colourless adjective - Weak in color; not colorful.
Undefined and colourless are semantically related. In some cases you can use "Undefined" instead an adjective "Colourless".
Undefined
Undefined adjective - Not seen or understood clearly.
Colourless and undefined are semantically related. Sometimes you can use "Colourless" instead an adjective "Undefined".
Cite this Source
Undefined and Colourless. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/colourless/undefined
Colourless & Undefined. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/colourless/undefined>.
Undefined or Colourless. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/colourless/undefined.
Google Ngram Viewer shows how "colourless" and "undefined" have occurred on timeline