impugn

"The witness gave testimony about what she saw during the schoolyard fight. "

"The teacher was pointing to the map on the wall. "

"What is your question?"

"academic / artistic / emotional / intellectual honesty"

"The detective noticed inconsistencies in the suspect's story, making him doubt its truthfulness. "

"My sister is very helpful, especially when it comes to organizing things. "

"The validity of the student's excuse for missing class was questioned by the teacher. "

"It is hard work to swim against the current."

"She can bear witness, since she was there at the time."

"The reliability of the internet connection was crucial for completing the online assignment. "

"Dumbstruck with joy, she was unable to express herself verbally, but the gratitude in her face was evident to all."

"to make assault upon a man, a house, or a town"