Mismatched vs. Mixmatch: What's the Difference?

Simple past tense and past participle of mismatch

Unsuitably matched; ill joined.

Matched unsuitably; grouped into pairs or sets with incompatible characteristics.

Of very unequal ability; - of contestants in a contest. The less able contestant is said to be overmatched or outclassed.

Either not matched or unsuitably matched

(of a contest or contestants) not fairly matched as opponents;