unlearnableadj.
/(ˌ)ʌnˈləːnəbl/, U.S. /ˌənˈlərnəb(ə)l/ Not learnable; impossible to learn.
ΚΠ
1785 New Rev. Jan. 4 Spare some of us the trouble of learning..the unlearnable and useless language.
1828 Edinb. Rev. May 492 This unlearnable system of speaking.
1847 J. H. Burton Lives Ld. Lovat & D. Forbes 72 That unlearnable self-estimate which insensibly exacts obedience.
1873 Dwight's Jrnl. Music 3 May 9/1 The inexplicable, unlearnable significance of drawing.
1908 Classical Jrnl. 3 174 Greek is endless and unlearnable.
1962 Our Sunday Visitor 25 Mar. 10/3 The climate was abominable, the language seemingly unlearnable.
2013 Press (Christchurch, N.Z.) (Nexis) 15 Aug. 2 The complexities of the audio system are designed to be almost unlearnable.
This entry has been updated (OED Third Edition, June 2017; most recently modified version published online March 2022).
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adj.1785