reason against (something)

reason against (something)

To attempt to use logical reasoning in order to disprove, counter, or dissuade someone from something. You're wasting your breath trying to reason against his dumb arguments. It doesn't matter how much logic or truth you present, it's still not going to change his mind. I kept trying to reason against the board's decision, but they were determined to follow through with their plan.
See also: reason

reason against something

to argue against something, using reason. I can hardly be expected to reason against a silly argument like that! I reasoned against it, but they paid no attention to me.
See also: reason