hidden

/ˈhɪdən/
adjective
  1. Placed or kept out of sight; concealed.
    • The hidden treasure was buried under an old oak tree.
    • The spy had a hidden camera in his glasses.
    • She found a hidden message inside the book.
  2. Not easily noticed or understood; secret or obscure.
    • The movie has a hidden meaning that only careful viewers catch.
    • He has a hidden talent for playing the piano.
    • There is a hidden cost to that subscription service.
verb
  1. Past participle of hide; to have put something or someone out of sight.
    • They have hidden the key under the doormat.
    • The cat had hidden under the bed during the storm.
    • She has hidden the birthday presents in the closet.