hiddenmostadj.
/ˈhɪd(ə)nməʊst/ Most hidden or secret.
ΘΚΠ
the mind > mental capacity > knowledge > secrecy, concealment > [adjective] > most
lockedOE
severe1735
secret as the grave1832
hiddenmost1892
1892 E. C. Stedman in Cent. Mag. Apr. Describe, express, interpret, the hiddenmost nature of man.
This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2018).
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adj.1892