Counterargument (noun)

1. An argument or set of reasons given in opposition to a previous argument or set of reasons.
2. A point or set of points made to refute or disprove a previous argument.

Origin:

Derived from the combining of the words "counter" (against) and "argument" (a reason or set of reasons given in support of an idea or action).

Examples:

1. The lawyer presented a counterargument to the prosecution's case.
2. The student's counterargument was that the data used in the study was unreliable.
3. The counterargument to the proposal is that it would be too costly.
4. He had no counterargument to the evidence presented.
5. The counterargument to this claim is that it is based on anecdotal evidence.