Sorry, no online dictionaries contain the exact phrase opposite of fastened.
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Reverse dictionary results:
1. bonnet
 2. drag
3. fast
4. lace
5. set
6. shut
7. table
8. boom
9. anchor
10. attached
 11. ball
12. buttoned
13. free
14. freeing
15. hook
16. loose
17. basil
18. bow
19. pale
20. screwed
 21. slip
22. slipped
23. slipping
24. slips
25. tables
26. tack
27. upping
28. ups
29. apron
30. barred
 31. bolted
32. bundle
33. button
34. cardigan
35. catch
36. fasting
37. float
38. frog
39. latched
40. lock

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