Here's what rhymes with whiggishness.
piggishness priggishness Words that almost rhyme with whiggishness
willingness impishness skittishness fierceness siliceous cliquishness griminess filminess spirituous spiritless jinrickshas jinrikshas litigants iniquitous indigents implicitness coincidence certificates precipitous ubiquitous explicitness duplicitous significance serendipitous insignificance