How to Use "impugn" with Example Sentences

1. Bob herz , the fasb 's chairman , decried those who " impugn our motives " .
2. One corner-cutting researcher does not impugn a whole field .
3. Both attempted unsuccessfully - to impugn its accuracy .
4. The father does not impugn her capacity as a good mother .
5. They were daring to impugn the profession of medicine .