1) Ill-assorted 2) Ill-sorted 3) Incompatible 4) Irreconcilable 5) Mismated 6) Unable to coexist 7) Unable to get along 8) Unmatched 9) Unmated 10) Unpaired 11) Unsuited 1) Incompatible 2) Mismated 3) Unlike 4) Unmatched 5) Unpaired 6) Unsuited 
[adj] - either not matched or unsuitably matched 2. [adj] - (of a contest or contestants) not fairly matched as opponents
uneven adjective (of a contest or contestants) not fairly matched as opponents; `vaudeville...waged an uneven battle against the church`