1. Unacceptable
2. Unwanted
3. Unsuitable
4. Unfit
5. Inadequate
6. Unsatisfactory
7. Incompatible
8. Disagreeable
9. Unsatisfying
10. Unacceptable
11. Unserviceable
12. Unbecoming
13. Unfriendly
14. Unpleasing
15. Insufficient
16. Unsuited
17. Unconforming
18. Unhelpful
19. Unsound
20. Uncooperative
21. Unacceptable
22. Unwelcome
23. Unfit
24. Unworkable
25. Unsatisfactory
26. Unacceptable
27. Unsuitable
28. Inadmissible
29. Unacceptable
30. Unfit

Finding synonyms for the word «not» can be a great way to add variety to your writing. Whether you’re looking for a more creative way to express yourself or you’re trying to avoid using the same words over and over again, having a list of synonyms can make it easier to find the right words. There are many different synonyms for «not» that you can choose from, depending on the context you’re writing in. Some of the best ideas include unacceptable, unwanted, unsuitable, unfit, inadequate, unsatisfactory, incompatible, disagreeable, unsatisfying, unserviceable, unbecoming, unfriendly, unpleasing, insufficient, unsuited, unconforming, unhelpful, unsound, uncooperative, unwelcome, unfit, unworkable, unsatisfactory, inadmissible, and unfit. With this list of synonyms, you can easily find the perfect word to express yourself without having to repeat the same words over and over again.