Neutral:
* Rebuttal: This is a formal term for a reasoned and structured response that directly addresses and refutes the arguments presented in the opposing viewpoint.
* Counterargument: Similar to rebuttal, but may not be as formal. It focuses on presenting arguments against the opposing viewpoint.
* Response: A general term for any verbal reaction to the argument. It can be anything from a simple disagreement to a detailed explanation of your own position.
* Reply: Another general term, implying that the response is directed specifically to the previous statement.
More assertive:
* Refutation: This term implies a strong and forceful response, aiming to completely disprove the opposing viewpoint.
* Challenge: This suggests a direct confrontation of the opposing argument, questioning its validity or logic.
* Disagreement: A straightforward statement of not agreeing with the opposing viewpoint.
More nuanced:
* Clarification: Focuses on clarifying misunderstandings or asking for further explanation of the opposing argument.
* Alternative perspective: Offers a different way of looking at the issue, potentially suggesting a compromise or a different solution.
The best term to use will depend on the specific context and the intent of the speaker.