1. Abstain
2. Avert
3. Block
4. Check
5. Debar
6. Deflect
7. Deter
8. Disallow
9. Discourage
10. Forefend
11. Forbid
12. Forestall
13. Halt
14. Hinder
15. Inhibit
16. Intercept
17. Obstruct
18. Prohibit
19. Refrain
20. Reject
21. Repel
22. Resist
23. Restrain
24. Rule out
25. Shield
26. Stop
27. Thwart
28. Turn away
29. Ward off
30. Withhold

When it comes to preventing something from happening, there are many different words that can be used to express this idea. Synonyms for prevent include abstain, avert, block, check, debar, deflect, deter, disallow, discourage, forefend, forbid, forestall, halt, hinder, inhibit, intercept, obstruct, prohibit, refrain, reject, repel, resist, restrain, rule out, shield, stop, thwart, turn away, ward off, and withhold. These words can be used in a variety of contexts, from preventing a person from doing something to preventing an event from occurring.

The best ideas for preventing something from happening are to be proactive in taking steps to stop it before it starts. This could mean implementing rules or regulations that limit certain behaviors or activities, or it could mean providing education or resources that discourage certain activities. Taking the time to think of all the different ways that something could be prevented is the best way to ensure that it does not happen in the first place.