of hide
unseen, secret
Cases of word usage
1) with a hidden meaning or a meaning not easily understood (cryptic)
2) an animal's hidden lying-place (den)
3) a hidden place where wild animals, birds etc may be observed, e.g. by photographers; (an) animal's skin (hide)
4) having, concerning, hidden meaning or spiritual power; causing feelings of awe and wonder (mystical)
5) the state of being hidden or unknown; something that is obscure (obscurity)
6) serious and honest; with nothing hidden or avoided; easy to understand or do (straightforward)
7) (of a person, action) deceptive; (of work etc) having hidden or unexpected difficulties (tricky)
8) basic; hidden but able to be found (underlying)