Sorry, no online dictionaries contain the exact phrase hard to classify.
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Reverse dictionary results:
1. nondescript
 2. anomaly
3. peg
4. classified
5. collate
6. pigeonhole
7. placed
8. placing
9. range
10. sort
 11. arrange
12. digest
13. group
14. label
15. labeled
16. labelled
17. place
18. ranged
19. ranging
20. rank
 21. ranked
22. ranking
23. rate
24. serotype
25. size
26. stamp
27. staple
28. type
29. ambiguous
30. nondenominational
 31. thingamajig
32. unclassifiable
33. invalid
34. will
35. aad
36. afar
37. atom
38. axe
39. best
40. box

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You can look up the words in the phrase individually using these links:   hard ?   to ?   classify ?
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hard*to search for words beginning with hard, or
*sifyto search for words ending with sify
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