• eoyal ulster constabulary,
• doyal ulster constabulary,
• foyal ulster constabulary,
• toyal ulster constabulary,
• 5oyal ulster constabulary,
• 4oyal ulster constabulary,
• riyal ulster constabulary,
• rkyal ulster constabulary,
• rlyal ulster constabulary,
• rpyal ulster constabulary,
• r0yal ulster constabulary,
• r9yal ulster constabulary,
• rotal ulster constabulary,
• rogal ulster constabulary,
• rohal ulster constabulary,
• roual ulster constabulary,
• ro7al ulster constabulary,
• ro6al ulster constabulary,
• royzl ulster constabulary,
• roysl ulster constabulary

The adjective form of "Royal Ulster Constabulary" would be "Royal Ulster Constabulary". The term itself is a proper noun and typically used as a name or title for the former police force in Northern Ireland. There may not be a specific adjective form for this term as it is already descriptive enough without modification. However, if you want an alternative, you can use "Ulster Constabulary" as an adjective by removing the word "Royal" for simplified reference.