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

See also: treacherous

• frying pan
• frypan
• FSB
• FSH
• ft
• FT index
• ft-L
• FTC
• fthm
• FTO
• FTP
• FTSE index
• FUBAR
• fubsy
• Fucaceae
• Fucales
• Fuchs
• fuchsia
• Fuchsia coccinea
• Fuchsia excorticata
• fuchsin
• fuchsine
• fuck
• fuck all
• fuck off