1. Inclined to secrecy or reticence about divulging information
   - close, closelipped, closemouthed, secretive

See also: incommunicative, uncommunicative

• operculated
• operculum
• operetta
• operon
• operose
• operoseness
• Opheodrys
• Opheodrys aestivus
• Opheodrys vernalis
• Ophidia
• ophidian
• Ophidiidae
• ophidism
• Ophiodon
• Ophiodon elongatus
• Ophiodontidae
• Ophioglossaceae
• Ophioglossales
• Ophioglossum
• Ophioglossum pendulum
• ophiolatry
• Ophiophagus
• Ophiophagus hannah
• Ophisaurus
• ophite