The Collaborative International Dictionary
classified \classified\ adj.
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arranged into classes or categories; as, unclassified.
Syn: categorized.
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assigned to a class of documents withheld from general circulation; -- of information or documents. Opposite of unclassified.
Note: [Narrower terms: eyes-only; confidential; restricted; secret; sensitive; top-secret]
Wiktionary
a. (context espionage of documents English) meant to be read only, and not discussed, by the named recipient, classified
WordNet
adj. official classification for documents; meant to be seen by only the person to whom it is directed
Usage examples of "eyes-only".
A quick check through some eyes-only files had revealed that the Clal va Riguez Sal was referring to was, in fact, one of the old cover names for Bros Sperin.
It had no face below slanted, accusing eyes-only a mass of Medusian, carved tentacles.
All other messages were delivered by either his secretary or, in the case of Eyes-Only, by one of the Signal Corps officers or warrant officers in the message center.