To provide an accurate ranking of Southeast Asian countries from the most fully democratic to the least democratic, I'll list them based on their general political systems and democratic practices as of my last knowledge update in October 2023:
- Indonesia
- Philippines
- Thailand
- Malaysia
- Singapore
- Myanmar (Burma)
- Vietnam
- Laos
- Brunei
Keep in mind that the democratic status of countries can fluctuate due to political changes and events. It’s advisable to check the latest resources for the most current information.