Sorry, no online dictionaries contain the exact phrase an unproven theory.
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Reverse dictionary results:
1. nostrum
2. conjecture
3. myth
4. opinion
5. esp
6. faith
7. rumored
8. experiment
9. explode
10. exploded
11. hypothesis
12. mysticism
13. prove
14. proving
15. thesis
16. canard
17. circle
18. circles
19. circling
20. conceit
21. convince
22. daydream
23. daydreaming
24. delusion
25. demonstrably
26. gossip
27. hallucination
28. idle
29. indirect
30. lemma
31. manipulative
32. nihilism
33. notionality
34. shot
35. show
36. showed
37. speculative
38. unfounded
39. establish
40. practical

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