1. At the proper time
   "she was duly apprised of the raise"
   - punctually 
2. In a due, fit, or becoming manner; as it ought to be; properly

See also: due

• cluck
• clucking
• clue
• clue in
• clued-up
• clueless
• clumber
• clumber spaniel
• clump
• clumping
• clumpy
• clumsily
• clumsiness
• clumsy
• clumsy person
• clunch
• clunk
• clunker
• clunking
• clunky
• Clupea
• Clupea harangus
• Clupea harengus harengus
• Clupea harengus pallasii
• Clupea sprattus