Mismanaged rhymes with:
micromanaged, unmanaged, micromanaged, unmanaged, micromanaged, unmanaged, acknowledged, advantaged, disadvantaged, disparaged, encouraged, envisaged, hemorrhaged, leveraged, micromanaged, mortgaged, overleveraged, packaged, pillaged, presaged, ravaged, repackaged, rummaged, salvaged, savaged, underpriviledged, unleveraged, unmanaged
Mismanaged sounds like:
machinist, macknight, magnesite, maximized, mcknight, mcnaught, mechanized, miscommunicate, misogynist