1. In a disloyal and faithless manner
   "he behaved treacherously"
   - faithlessly, traitorously, treasonably, false

See also: treacherous

• pitfall
• pith
• pith hat
• pith helmet
• pithead
• Pithecanthropus
• Pithecanthropus erectus
• Pithecellobium
• Pithecellobium dulce
• Pithecellodium unguis-cati
• Pithecia
• Pithecolobium
• pithily
• pithiness
• pithy
• pitiable
• pitiably
• pitiful
• pitifully
• pitiless
• pitilessly
• pitilessness
• pitman
• Pitocin
• piton