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

• penetration bomb
• penetrative
• penetratively
• penetrator
• Peneus
• penguin
• pengö
• penial
• penicillamine
• penicillate
• penicillin
• penicillin F
• penicillin G
• penicillin O
• penicillin V
• penicillin V potassium
• penicillin-resistant
• penicillin-resistant bacteria
• penicillinase
• penicillinase-resistant antibiotic
• Penicillium
• penile
• penile implant
• peninsula
• peninsular