impugn
verb (used with object)
to challenge as false (another's statements, motives, etc.); cast doubt upon.
Used to describe an ongoing action or state that is currently taking place in the immediate present.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
I feel assured of that, sir; don't mistake me for a moment, or suppose I am impugning them.
From Sir Jasper Carew His Life and Experience by Charles James Lever