Sorry, no online dictionaries contain the exact phrase not frightening.
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Reverse dictionary results:
1. non-threatening
 2. harmless
3. benign
4. safe
5. inoffensive
6. low-keyed
7. no problem
8. non-violent
9. uncleanly
10. unexacting
 11. anodyne
12. inelegant
13. innocuous
14. nonglamorous
15. nonsensitive
16. peaceful
17. unadventurous
18. unalluring
19. unbrilliant
20. unchallenging
 21. uncomely
22. uncompelling
23. undutiful
24. unedifying
25. unelegant
26. unendearing
27. unenergetic
28. unengaging
29. unentertaining
30. unenvious
 31. unexciting
32. unflamboyant
33. unflashy
34. ungainful
35. ungreen
36. unhasty
37. unhomely
38. unjoyous
39. unloving

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You can look up the words in the phrase individually using these links:   not ?   frightening ?
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