Pusillanimous rhymes with:
magnanimous, unanimous, anonymous, autonomous, magnanimous, synonymous, unanimous, venomous, anonymous, artemus, autonomous, blasphemous, clackamas, hippopotamus, infamous, magnanimous, monogamous, polygamous, synonymous, thalamus, unanimous, venomous
Pusillanimous sounds like:
pickling, posluns, psalms, puzzling