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

See also: treacherous

• lower rank
• lower respiratory infection
• lower respiratory tract
• lower respiratory tract smear
• Lower Saxony
• lower status
• Lower Tunguska
• lower-case letter
• lower-middle-class
• Lower-Normandy
• lower-ranking
• lowercase
• lowerclassman
• lowered
• lowering
• loweringly
• lowermost
• lowery
• lowest
• lowest common denominator
• lowest common multiple
• lowland
• lowland burrowing treefrog
• lowland fir
• Lowland Scot