Intelligent
Intelligent adjective - Having or showing quickness of mind.
Quiet and intelligent are semantically related. In some cases you can use "Quiet" instead an adjective "Intelligent".
Quiet
Quiet adjective - Free from disturbing noise or uproar.
Intelligent and quiet are semantically related. Sometimes you can use "Intelligent" instead an adjective "Quiet".
Mutual synonyms
Both words in one sentence
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They're not actually related, but Tengen Toppa Gurren Lagann's Simon and Kamina were definitely designed to fit the trope — Simon is shy, relatively sensible, quiet and intelligent, where Kamina is outgoing, reckless, big-mouthed and something of an idiot.
Source: Sibling Yin-Yang -
He's also probably the least intelligent of the regular cast (apart from wacky neighbors like Floyd and Heywood), though he comes across as one of the most soulful because he is so quiet.
Source: The Quiet One -
Sol Weintraub is a quiet, extremely intelligent old professor who would go up against the Shrike and his own God to heal his daughter.
Source: Literature / Hyperion Cantos
Cite this Source
Quiet and Intelligent. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/intelligent/quiet
Intelligent & Quiet. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/intelligent/quiet>.
Quiet or Intelligent. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/intelligent/quiet.
Google Ngram Viewer shows how "intelligent" and "quiet" have occurred on timeline