Not expressed

• Not openly made known
• The next to highest level of official classification for documents
• Indulging only covertly
• Communicated covertly
• Having an import not apparent to the senses nor obvious to the intelligence
• Squirrel, at times
• Designed to elude detection
• Hidden from general view or use

Wiktionary Word definitions in Wiktionary
n. (alternative spelling of secretor English)