Adult
Adult adjective - Relating to or typical of adults; displaying proper maturity.
Mutual synonyms
Both words in one sentence
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Lampshaded during "Thirst Patrol"Narrator: Once he appears, Kool-Aid Man has been known to demonstrate his unexpectedly efficient abilities on skateboards, horses, toboggans and go-karts much to the chagrin of nearby adult authority figures.
Source: Advertising / Wacky Zany Video -
It has become much faster and simpler to create a Super Soldier body and then import an adult consciousness into it, than to speed-grown soldiers It is faster and more efficient to raise speed-grown Super Soldiers.
Source: Literature / Old Man's War - There weren't a lot of kids fighting in the war (which doesn't mean that they weren't dying in it), and a fully grown healthy adult is going to make a stronger, stabler, more efficient, soldier than a child. Usually.
Source: Immortality Begins at 20
Cite this Source
Efficient and Adult. (2016). Retrieved 2026, July 27, from https://thesaurus.plus/related/adult/efficient
Adult & Efficient. N.p., 2016. Web. 27 Jul. 2026. <https://thesaurus.plus/related/adult/efficient>.
Efficient or Adult. 2016. Accessed July 27, 2026. https://thesaurus.plus/related/adult/efficient.
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