Brainless
Brainless adjective - Not having or showing an ability to absorb ideas readily.
Usage example: a teacher who affirms that there are no brainless students, only lazy ones
Reasonable is an antonym for brainless.
Reasonable
Reasonable adjective - Having the ability to reason.
Usage example: some people once believed that women were not by nature reasonable beings, but generations of female scholars have proved those people wrong
Brainless is an antonym for reasonable.
Both words in one sentence
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Cut to five years later where we find that the brainless apes have sacked the settlements of the more intelligent, reasonable species.
Source: Humans Are Morons
Cite this Source
Reasonable and Brainless. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/brainless/reasonable
Brainless & Reasonable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/brainless/reasonable>.
Reasonable or Brainless. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/brainless/reasonable.
Google Ngram Viewer shows how "brainless" and "reasonable" have occurred on timeline