1. Not recognized or admitted 
2. Not openly acknowledged
   "an unacknowledged emergency"

See also: acknowledgement, acknowledgment, recognition, secret, unappreciated, unavowed, unconfessed, undeclared, unknown, unrecognised [Brit], unrecognized, unsung, unvalued

Antonym: acknowledged

• mesophytic
• mesophytic plant
• Mesopotamia
• mesosphere
• mesothelioma
• mesothelium
• mesotron
• Mesozoic
• Mesozoic era
• Mespilus
• Mespilus germanica
• mesquit
• mesquite
• mesquite gum
• mess
• mess about
• mess around
• mess hall
• mess jacket
• mess kit
• mess of pottage
• mess-up
• message
• message pad
• messaging