holocryptic

From holo- +‎ cryptic.

• (Received Pronunciation) IPA^(key): /ˌhɒl.əˈkɹɪp.tɪk/
• (General American) IPA^(key): /ˌhɑ.ləˈkɹɪp.tɪk/
• Rhymes: -ɪptɪk

holocryptic (not comparable)

1. 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.

   A holocryptic code

• “holocryptic”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.