Impugn

Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 204

im-puii', v.t. [-pugned (-piind'), -pugning.] To attack by words or arguments, contradict, call in question. — Impugn'able, -pun'aor -piig'na-bl, a. Capable of being, etc. — Impugn'er, n.