WordWeb Online

1. Of an obscure nature
   "the new insurance policy is written without cryptic or mysterious terms";
   - cryptical, deep, inscrutable, mysterious, mystifying
    
2. Having a secret or hidden meaning
   "cryptic writings";
   - cabalistic, kabbalistic, qabalistic, cryptical, sibylline, cabbalistic
    
3. Having a puzzling terseness
   "a cryptic note"

See also: concise, esoteric, incomprehensible, inexplicable

Encyclopedia: Cryptic