Difference between Unimpeachable and Unexceptionable

What is the difference between Unimpeachable and Unexceptionable?

Unimpeachable as an adjective is not able to be impeached or reproached while Unexceptionable as an adjective is beyond reproach; unimpeachable

We hope you now know whether to use Unimpeachable or Unexceptionable in your sentence.