introuvableadj.
/antruːˈvɑːblə/ Unfindable, undiscoverable; spec. of books. Also as n.
ΘΚΠ
the mind > mental capacity > knowledge > hiding, concealing from view > [adjective] > incapable of discovery
investigablea1425
indiscoverable1640
undiscoverable1642
inexplorable1646
inconspicuous1648
traceless1651
unsuspectable1660
introuvable1824
undetectible1827
undetectable1863
society > communication > book > kind of book > rare book(s) > [adjective]
rarissime1843
introuvable1895
society > communication > book > kind of book > rare book(s) > [noun]
rare book1584
rariora1859
curiosa1883
rarissima1883
introuvable1963
1824 Edinb. Rev. Mar. 2 We are by no means of opinion that it [sc. a correct standard of national prosperity] is really introuvable.
1856 Newsp. & Gen. Reader's Compan. ii. §1436 Give me a mere annonce of any thing, that can tell me of your introuvable friend.
1895 H. B. Forman in Nicoll & Wise Lit. Anecdotes 19th Cent. I. 67 The almost introuvable tract Prothanasia and other Poems.
1963 Times Lit. Suppl. 15 Feb. 116/3 A potential introuvable to future collectors.
This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2018).
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adj.1824