unleakableadj.
/(ˌ)ʌnˈliːkəbl/, U.S. /ˌənˈlikəb(ə)l/ That does not leak; not susceptible to leakage.
ΘΚΠ
the world > space > relative position > closed or shut condition > [adjective] > stopping up or blocking > without leak or tight
tight1507
unleakable1838
leakless1899
leak-proof1926
1838 Morning Post 25 Sept. Metallic pistons, air-tight joinings, unleakable valves.
1859 Times 9 June 3/4 (advt.) All who wish to adopt a patent cheap process rendering casks perfectly unleakable may see several which have been made entirely oiltight.
1902 C. Baker's Catal. Microscopes 34 A Solid [Glass] Trough..practically unleakable.
2007 South China Morning Post (Nexis) 26 June 9 The landfill..is now sealed in unleakable material under the ground.
This entry has been updated (OED Third Edition, June 2017; most recently modified version published online March 2022).
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adj.1838