Difference between Unmatched and Mismatched

Unmatched

Part of speech: verb

Definition: To separate a matching pair.

Part of speech: adjective

Definition: not matched; odd peerless; unrivalled; beyond comparison

Example sentence: John Boehner is the ultimate Beltway hack, a man whose unmatched and self-serving skill at political survival has made him, after two decades in Washington, the hairy blue mold on the American congressional sandwich.

Mismatched

Part of speech: verb

Definition: To match unsuitably; to fail to match

Part of speech: adjective

Definition: Unsuitably matched; ill joined.