Sorry, no online dictionaries contain the exact phrase opposite of sincere.
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Reverse dictionary results:
1. deep
 2. come
3. plain
4. real
5. true
6. thin
7. thinned
8. thinning
9. candid
10. solemn
 11. truthful
12. endeavour
13. acute
14. afar
15. against
16. aid
17. aided
18. analytical
19. anger
20. anima
 21. another
22. argument
23. ascetic
24. atheism
25. attached
26. aver
27. basil
28. bbs
29. chase
30. clash
 31. closed
32. constant
33. crosscountry
34. cry
35. deny
36. difference
37. double
38. ecliptic
39. exposure
40. fast

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   sincere ?
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