1. not officially recognized, approved, or set up by an authority or institution
Usage: formal; often used in legal, religious, or institutional contexts
2. not yet proven, confirmed, or accepted as true or valid
Usage: formal

Examples

• The nonestablished church operated independently from state control.
• Several nonestablished facts in the report require further investigation.
• Nonestablished businesses often struggle to gain credibility with investors.
• The researcher presented nonestablished theories that challenged conventional wisdom.
• Nonestablished religions have fewer legal protections in some countries.
• The committee rejected the nonestablished claims without sufficient evidence.