1. (informal) no longer maintaining contact or communication 
2. (informal) no longer up to date; not well informed with recent developments

Encyclopedia: Out of touch

• opacify
• opacity
• opah
• opal
• opal glass
• opalesce
• opalescence
• opalescent
• opaline
• opalise
• opalize
• opaque
• opaque gem
• opaquely
• opaqueness
• OPCW
• ope
• OPEC
• Opel
• open
• open access
• open account
• open chain
• open circuit
• open cluster