1. Opposed
2. Contrary
3. Antagonistic
4. Adverse
5. Hostile
6. Antipathetic
7. Averse
8. Contradictory
9. Inimical
10. Unfavorable
11. Antipodean
12. Antithetical
13. Clashing
14. Counter
15. Disagreeing
16. Dissenting
17. Incompatible
18. Inconsistent
19. Conflicting
20. Repugnant
21. Adverse
22. Antipathetical
23. Antithetic
24. At odds
25. Contrarious
26. Cross
27. Disaffirming
28. In opposition
29. Negative
30. Unfriendly

When searching for the best ideas for synonyms for the word “against”, it is important to consider the context in which the word is being used. For example, if a person is looking to express an idea that is in opposition to another, then words such as opposed, hostile, and adverse may be the best option. On the other hand, if the idea is to express a contradictory point of view, then words such as contrary, contradictory, and inconsistent may be the best choice. Additionally, words such as antipodean, antithetical, and clashing can be used to describe the idea of two opposing sides. No matter the context, there are plenty of synonyms for the word “against” that can be used to effectively communicate an idea.