Sorry, no online dictionaries contain the exact phrase opposite of gullible.
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Reverse dictionary results:
1. hick
2. fool
3. fooling
4. babe
5. born
6. chump
7. green
8. gull
9. mark
10. mug
11. myg
12. sucker
13. unwary
14. bit
15. bite
16. dupe
17. muggins
18. however
19. ripe
20. periwinkle
21. sage
22. absinthe
23. absurd
24. affable
25. approachable
26. befooling
27. blanch
28. chat
29. chatting
30. colour
31. colt
32. conversable
33. eli
34. facile
35. flay
36. greenside
37. iguana
38. lob
39. mashie niblick
40. mean

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   gullible ?
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*ibleto search for words ending with ible
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