cryptic

Short definition from Wiktionary

Adjective

1. 1
   Having hidden (unapparent) meaning.
2. 2
   Mystified or of an obscure nature; not easy to perceive.
3. 3
   Involving use of a code or cipher.
4. 4
   Of a crossword puzzle, or a clue in such a puzzle, using, in addition to definitions, wordplay such as anagrams, homophones and hidden words to indicate solutions.
5. 5
   Well camouflaged; having good camouflage.
6. 6
   Serving as camouflage.
7. 7
   Apparently identical, but actually genetically distinct.
8. 8
   Living in a cavity or small cave.

Noun

1. 1
   A cryptic crossword puzzle.