1. Not addressed
   "an unaddressed envelope"

Antonym: addressed

• bête noire
• bêtise
• c
• C and W
• C battery
• C clef
• C compiler
• C major
• C major scale
• C of E
• C program
• c'est la vie
• c'mon
• C-clamp
• C-horizon
• c-note
• c-number
• C-ration
• C-reactive protein
• C-section
• C. D. Gibson
• C. diphtheriae
• C. H. Best
• C. K. Ogden
• C. Northcote Parkinson