Strong’s Greek
G2931 — kruphe
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
κρυφῇ
kruphe — pronounced kroo-fay'
adverb from 2928; privately:--in secret. see GREEK for 2928
1 occurrence in the KJV.
Ephesians 5:12
For it is a shame even to speak of those things which are done of them in secret.