ἀπόκρυφον [2 verses](adj sg neut nom) "Secret" is apokryphos, which means "hidden", "concealed", "underhand", "unknown",  "obscure", "recondite", and "hard to understand".  -- "Secret" is an adjective that means "hidden", "concealed", "underhand", "unknown",  "obscure", "recondite", and "hard to understand".