Abstract and Undefined

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Abstract adjective - Dealing with or expressing a quality or idea.

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Undefined and abstract are semantically related. In some cases you can use "Undefined" instead an adjective "Abstract".

Undefined adjective - Not seen or understood clearly.

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Abstract and undefined are semantically related. Sometimes you can use "Abstract" instead an adjective "Undefined".

Cite this Source

Undefined and Abstract. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/abstract/undefined

Abstract & Undefined. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/abstract/undefined>.

Undefined or Abstract. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/abstract/undefined.

Google Ngram Viewer shows how "abstract" and "undefined" have occurred on timeline