oppugn

• Throughout the negotiations he performed masterfully and has been seeking to oppugn every argument of indictment.
• If nothing can oppugn love, 385 —  Hudibras
• A skeptic can only _doubt_, never _oppugn_ the gospel. —  The Christian Foundation, Or, Scientific and Religious Journal, May, 1880
• But in promiscuous company no prudent man will oppugn the merits of a contemporary in his own supposed department; contenting himself with praising in his turn those whom he deems excellent. —  Biographia Literaria
• If thou judge him, he will condemn thee; if thou oppugn his absolute and holy decrees, he will hold thee fast bound by them to thy condemnation; he needs no other defence but to call out thy own conscience against thee, and bind thee over to destruction. —  The Works of the Rev. Hugh Binning

Roget's II: The New Thesaurus

Allen's Synonyms and Antonyms