Sorry, no online dictionaries contain the exact phrase what is lacking in the assumptions.

Reverse dictionary results:
1. fallacy
2. flaw
3. weakness
4. deficiency
5. shortcoming
6. defect
7. deficience
8. defective
9. defectiveness
10. demerit
11. faultful
12. defailance
13. defectibility
14. defectible
15. deficient
16. deficit
17. deprivation
18. disadvantage
19. errant
20. errour
21. lack
22. low
23. misproportioned
24. scarcity
25. shortage
26. amissing
27. disoccupation
28. fault
29. faulty
30. impairment
31. insufficiency
32. lacke
33. limitation
34. neglect
35. privation
36. shortfall

You can look up the words in the phrase individually using these links:   what ?   is ?   lacking ?   in ?   the ?   assumptions ?
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