Usually means: Highly confidential, known by few.
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We found 4 dictionaries that define the word ultrasecret:

General (4 matching dictionaries)
  1. ultrasecret: Merriam-Webster
  2. ultrasecret: Collins English Dictionary
  3. ultrasecret: Wordnik
  4. ultrasecret: Wiktionary

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Definitions from Wiktionary (ultrasecret)

▸ adjective:  Extremely secret; of the utmost secrecy.

Similar:
ultrasevere, ultraintelligent, ultraintense, ultrarare, ultraquick, ultraclose, ultraintensive, ultraefficient, ultrarapid, ultracold, more...

Opposite:
public, open, transparent, accessible

Types:
top secret, codeword, compartmentalized, need-to-know, more...

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Similar:
ultrasevere, ultraintelligent, ultraintense, ultrarare, ultraquick, ultraclose, ultraintensive, ultraefficient, ultrarapid, ultracold, more...

Opposite:
public, open, transparent, accessible

Types:
top secret, codeword, compartmentalized, need-to-know, more...



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