Refute.
Synonyms:
confound, confute, disprove, overthrow, repel.
To refute and to confute are to answer so as to admit of no reply. To refute a statement is to demonstrate its falsity by argument or countervailing proof; confute is substantially the same in meaning, tho differing in usage. Refute applies either to arguments and opinions or to accusations; confute is not applied to accusations and charges, but to arguments or opinions. Refute is not now applied to persons, but confute is in good use in this application; a person is confuted when his arguments are refuted.