verb
disprove implies the presenting of evidence or reasoned arguments that demonstrate an assertion or belief to be false or erroneous; refute implies a more thorough assembly of evidence and a more careful development of argument, hence suggests conclusiveness of proof; confute suggests the overwhelming or silencing of a person by argument, proof, or rhetorical force; controvert implies a disputing or denying of statements, arguments, etc. in an endeavor to refute them; rebut stresses formality in refuting an argument, such as is observed in debate, court procedure, etc.
See disprove in Webster's New World Roget's A-Z Thesaurus II
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