From BiblePortal Wikipedia

Hawker's Poor Man's Concordance And Dictionary [1]

Hid, Hidden

I pause over these words merely to remark, that in Scripture they express a great deal. It was the custom very generally through the eastern world, to secrete and bury their treasures and valuables. We are told by a certain author, that there are a set of men who make it their business to go about in search of treasure supposed to have been hidden; and so general is the idea, that vast treasures are concealed in the earth, by men who died without making discovery of them to their friends, that this employment of digging in pursuit of wealth is a common thing. This will throw a great light upon those expressions in the word of God, which enjoin an earnest pursuit after the knowledge and love of the Lord. "If thou seekest after wisdom (saith Solomon,) as silver, and searchest for her as for hid treasures, then shalt thou understand the fear of the Lord, and find the knowledge of God." ( Proverbs 2:4-5) Nothing could be more happily chosen to intimate that earnest unwearied pursuit after Jesus, as men seeking for what lay buried out of sight. And when that life, which the apostle saith, is hid with Christ in God, ( Colossians 3:3) is discovered, yea, in the smallest degree, this is like what the Lord said to Cyrus: "I will give thee the treasure of darkness, and hidden riches of secret places." ( Isaiah 45:3) Views of Jesus, to the discovery by God the Holy Ghost, lead the soul to the enjoyment of him, "in whom are hid all the treasures of wisdom and knowledge." ( Colossians 2:3)

Webster's Dictionary [2]

(1): ( p. p.) of Hide

(2): ( p. p. & a.) from Hide. Concealed; put out of view; secret; not known; mysterious.

King James Dictionary [3]

HID'DEN, pp. of hide. Concealed placed in secrecy.

1. Secret unseen. 2. Mysterious.

International Standard Bible Encyclopedia [4]

hid ´' n  : The translation of ṭāman , "to hide," "to bury" (  Job 3:16 ); of cāphan "to conceal," "store up" ( Job 15:20 , "The number of years is hidden to the oppressor," the Revised Version (British and American) "even the number of years that are laid up for the oppressor," margin "and years that are numbered are laid up";  Job 24:1 , "Why, seeing times are not hidden from the Almighty," the Revised Version (British and American) "Why are times not laid up by the Almighty?" margin as the King James Version with "Why is it?" prefixed;  Psalm 83:3 , "They consulted (the Revised Version (British and American) "consult") against thy hidden ones"); of macpūnı̄m (from cāphan ), "hidden things or places" ( Obadiah 1:6 , "How are his hidden things sought up!" the Revised Version (British and American) "treasures," the American Standard Revised Version "sought out"); of pālā' , "to be wonderful," "difficult" ( Deuteronomy 30:11 , "This commandment ... is not hidden from thee," the Revised Version (British and American) "too hard for thee," margin "or wonderful"); of ḥāphas , Hithpael, "to hide one's self" ( Proverbs 28:12 , the Revised Version (British and American) "When the wicked rise, men hide themselves," margin (Hebrew) "must be searched for"); of kruptós , "hidden," "secret" ( 1 Peter 3:4 , "the hidden man of the heart";  1 Corinthians 4:5 , krupton , "the hidden things of darkness";  2 Corinthians 4:2 , "the hidden things of dishonesty," the Revised Version (British and American) "of shame"); of apokrúptō , "to hide away," trop., not to reveal or make known ( 1 Corinthians 2:7 , "But we speak God's wisdom in a mystery, even the wisdom that hath been hidden"; compare  Ephesians 3:9;  Colossians 1:26 ).

Among the occurrences of "hidden" in Apocrypha we have (2 Esdras 16:62), "The Spirit of Almighty God ... searcheth out all hidden things in the secrets of the earth," the Revised Version (British and American) "He who made all things and searcheth out hidden things in hidden places";  Sirach 42:19 , "revealing the steps (the Revised Version (British and American) "traces") of hidden things," apókruphos  ; 42:20, "Neither any word is hidden from him," the Revised Version (British and American) "hid," εκρυβε , ekrube .