unopenableadj.
/(ˌ)ʌnˈəʊp(ə)nəbl/, /(ˌ)ʌnˈəʊpn̩əbl/, U.S. /ˌənˈoʊp(ə)nəb(ə)l/ Not openable; firmly fastened, sealed, or closed.
ΘΚΠ
the world > space > relative position > closed or shut condition > [adjective] > closed or shut > able to be > not
unopenable1747
1747 Rules & Statutes Govt. Hertford Coll. 128 The Founder's Gate..is..as Unopenable after that Hour, as if it was fastened by a thousand Bars and Bolts.
1832 M. R. Mitford Our Village V. 36 Trying to lift the lid of the unopenable chest.
1947 Life 28 Apr. 129/1 Bringing samples of caviar in unopenable tins.
2010 W. Gillespie Keyhole Factory 36 The letter was soaked and unopenable.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online March 2022).
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adj.1747