Brainlessness and Mental deficiency

Brainlessness

Brainlessness noun - The quality or state of lacking intelligence or quickness of mind.
Usage example: the turkey is one bird that has often been cited for its brainlessness

Mental deficiency and brainlessness are semantically related. In some cases you can use "Mental deficiency" instead a noun "Brainlessness".

Mental deficiency

Mental deficiency noun - Mild mental retardation.

Brainlessness and mental deficiency are semantically related. Sometimes you can use "Brainlessness" instead a noun phrase "Mental deficiency".
Cite this Source
Mental deficiency and Brainlessness. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/brainlessness/mental_deficiency
Brainlessness & Mental deficiency. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/brainlessness/mental_deficiency>.
Mental deficiency or Brainlessness. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/brainlessness/mental_deficiency.
Google Ngram Viewer shows how "brainlessness" and "mental deficiency" have occurred on timeline