1. Based primarily on surmise rather than adequate evidence
   - conjectural, divinatory, hypothetical, supposed, suppositional, suppositious, supposititious

See also: theoretic, theoretical

• separation
• separation energy
• separationism
• separationist
• separatism
• separatist
• separative
• separator
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• Sephardi
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• sepia
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• Sept. 11
• septal
• septal defect
• septate