Sorry, no online dictionaries contain the exact phrase non well founded set theories.
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Reverse dictionary results:
1. sound
2. false
3. mull
4. based
5. firm
6. theoretical
7. real
8. just
9. good
10. built
11. correct
12. established
13. used
14. philosophy
15. created
16. formed
17. grounded
18. solid
19. maximal
20. horseshoe
21. relativity
22. mature
23. develop
24. ideology
25. pseudoscience
26. hold
27. socialism
28. swampland
29. unfounded
30. baseless
31. groundless
32. unsubstantiated
33. haploid
34. tenable
35. mind
36. well-grounded
37. valid
38. reverse
39. substantiated
40. township

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