Words the Bible translates as in secret

English uses one word here. The Bible uses 2 words, and they do not mean the same thing. Each is listed with what it actually means, most frequent first.

kruphēκρυφῇin secretnot studied yet
mistarמִסְתָּרa place out of sight: the cover someone watches or strikes from unseen, or where a person or a treasure is kept beyond finding

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Every English meaning beginning with I is on its letter page, and the whole index starts at Browse.