holocryptic UK /ˌhɒl.əˈkɹɪp.tɪk/US /ˌhɑ.ləˈkɹɪp.tɪk/ adjective1 •Wholly or completely concealing; incapable of being deciphered.A holocryptic cipher is one constructed so as to offer no clue to its meaning to anybody without the key.