Heavy
Key
Key adjective - Coming before all others in importance.
Mutual synonyms
Both words in one sentence
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Such as the "heavy boots" of grief slowing Oskar's progress, searching through the five remaining boroughs for the owner of the key.
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Somewhat justified, as XCOM is more of a black-ops unit tasked with assaulting key objectives, while leaving the heavy fighting to the rest of the Earth's militaries.
Source: Video Game / XCOM: Enemy Unknown -
This is because the key is made out of dwarf star material and is really heavy.
Source: Key Under the Doormat
Cite this Source
Key and Heavy. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/heavy/key
Heavy & Key. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/heavy/key>.
Key or Heavy. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/heavy/key.
Google Ngram Viewer shows how "heavy" and "key" have occurred on timeline