The Collaborative International Dictionary
odd unmatched unmated unpaired
mismatched \mis*matched"\ adj.
Matched unsuitably; grouped into pairs or sets with incompatible characteristics. [Narrower terms: ill-sorted, incompatible, mismated, unsuited; odd, unmatched, unmated, unpaired ] Also See: {incompatible. Antonym: matched.
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Of very unequal ability; -- of contestants in a contest. The less able contestant is said to be overmatched or outclassed.
Syn: uneven, not fairly matched.