Noun:
1: classified, classified advertisement, classified ad a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type
Adjective:
1: categorized, sorted, grouped, categorised, classified arranged into classes
2: sensitive, restricted, classified, secret, eyes-only, confidential, top-secret official classification of information or documents; withheld from general circulation; "thousands of classified documents have now been declassified"