Airtight
Airtight adjective - Not allowing air or gas to pass in or out.
Mutual synonyms
Both words in one sentence
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Season 1, episode 4 of Ashes to Ashes — Gene and Alex are locked in an airtight (and overheated) vault while searching a government facility.
Source: Locked in a Freezer -
Done completely straight in a Season One episode of Ashes to Ashes, with Alex Drake and Gene Hunt locked in a secure and near-airtight document vault.
Source: Getting Hot in Here - Alternately, their death may be assured by getting lost at sea, locked in an airtight coffin, seriously injured or catching/developing an incredibly deadly illness or disease.
Source: Doomed Protagonist
Cite this Source
Locked and Airtight. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/airtight/locked
Airtight & Locked. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/airtight/locked>.
Locked or Airtight. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/airtight/locked.
Google Ngram Viewer shows how "airtight" and "locked" have occurred on timeline