Slovenliness rhymes with:
loneliness, deadliness, ghastliness, holiness, liveliness, loneliness, niggardliness, orderliness, silliness, timeliness, ugliness, worldliness
loneliness, deadliness, ghastliness, holiness, liveliness, loneliness, niggardliness, orderliness, silliness, timeliness, ugliness, worldliness