Sorry, no online dictionaries contain the exact phrase opposite of untruthful.
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Reverse dictionary results:
1. truthful
2. honest
3. sincere
4. genuine
5. bona fide
6. bonafide
7. honestly
8. prosaic
9. unfeigned
10. direct
11. egally
12. evenhanded
13. forthright
14. holy writ
15. honest to goodness
16. man-to-man
17. plain-spoken
18. simply
19. singly
20. soothfast
21. soothfastness
22. square
23. stand-up
24. straight talk
25. trewth
26. troth
27. true
28. true colours
29. trueness
30. truth
31. truthfully
32. truthiness
33. veracious
34. veraciously
35. veracity
36. certainty

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