Sorry, no online dictionaries contain the exact phrase unknown substance.
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Reverse dictionary results:
1. mystery substance
 2. unidentified material
3. unknown compound
4. gunk
5. murrhine
6. something
7. stuff
8. stuffed
9. titration
10. analysis
 11. accident
12. challenge
13. coefficient
14. constant
15. somebody
16. spill
17. unit
18. dirt
19. grade
20. crystallite
 21. spilling
22. adventure
23. adventurous
24. algebra
25. anomalous
26. anxious
27. basque
28. bird
29. book
30. cardiomyopathy
 31. chance
32. cherub
33. contingent
34. country
35. curiosity
36. doodad
37. doodah
38. equivocal
39. etruscan
40. extrapolate

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You can look up the words in the phrase individually using these links:   unknown ?   substance ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
unkn*to search for words beginning with unkn, or
*anceto search for words ending with ance
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