Intelligent
Intelligent adjective - Having or showing quickness of mind.
Old
Old adjective - Being of advanced years and especially past middle age.
Intelligent is an antonym for old.
Both words in one sentence
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Mayor Davies's body was too old to handle it, so instead of improving his musculature, it made him prone to outbursts, and barely intelligent enough to communicate.
Source: Super Serum - In Superman: The Animated Series, Superman's old foe Brainiac got a new origin: instead of a mad scientist from the planet Colu, he was an intelligent supercomputer from Krypton.
Source: Where I Was Born and Razed - She is a 26-year-old woman, "intelligent and good-looking and well-educated", but currently unemployed and broke.
Source: Bibliography / Agatha Christie
Cite this Source
Old and Intelligent. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/intelligent/old
Intelligent & Old. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/intelligent/old>.
Old or Intelligent. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/intelligent/old.
Google Ngram Viewer shows how "intelligent" and "old" have occurred on timeline