Voluptuous
In the German language there are many adjectives that end in '-lich'.  Sportlich, freundlich, natürlich, rundlich, ärgerlich, kindlich, and pünktlich are a few of those.  These are translated as athletic (sporty), friendly, natural (naturally), round (roundly), irritated (angryly), kindly, and punctual (punctually).  The '-lich'acts as the '-ly' in English in a way.  So sometimes when I'm bored I flip through my German/English dictionary.  A few days ago I found the word veluptuous.  Veluptuous is defined as: full delight or pleasure of the senses; conductive to or arising from sensuous or sensual gratification; suggesting sensual pleasure by fullness and beauty of form.  The German word for voluptuous is sinnlich.  Following the '-lich' pattern that would be sinly.  Voluptuousness is sinful. Yup. Straight from the German language through me to you. Enjoy.