Sorry, no online dictionaries contain the exact phrase not fool proof.
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Reverse dictionary results:
1. reprobate
2. behave
3. axiom
4. opinion
5. faith
6. thought
7. view
8. proofed
9. proofs
10. unapproved
11. persuasion
12. sentiment
13. a priori
14. absolute
15. gratuitous
16. inconclusive
17. infirm
18. viewing
19. indemonstrable
20. shot-free
21. stultify
22. blinds
23. token
24. caret
25. cancel
26. cancelled
27. brand
28. reader
29. stet
30. branded
31. default
32. real
33. cedilla
34. crumpet
35. inexcusable
36. badge
37. footstep
38. lie
39. soft
40. trifle

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You can look up the words in the phrase individually using these links:   not ?   fool ?   proof ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
not *to search for words beginning with not , or
*roofto search for words ending with roof
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