acknowledged (adj.)

• accepted
• allowed
• approved
• authenticated
• avowed
• certified
• confessed
• confirmed
• conformable
• conventional
• correct
• customary
• decent
• decorous
• established
• fixed
• formal
• granted
• hallowed
• heroic
• hoary
• immemorial
• inveterate
• legendary
• long-standing
• meet
• mythological
• oral
• orthodox
• prescriptive
• professed
• proper
• ratified
• received
• recognized
• right
• rooted
• sealed
• seemly
• signed
• time-honored
• traditional
• true-blue
• understood
• unwritten
• validated
• venerable
• warranted
• worshipful