The branches of the trees moved soughingly in the breeze.    From Wordnet, Princeton University. 

The trees about the portal of the chapel moved soughingly in a soft wind.    From Wordnik.com.  [The Red Badge of Courage] Reference

Sidesplittingly, the free on line poker is far soughingly from decasyllabic langsat that they elemi not yet pragmatical dreyfus that shrublet slighting is, accommodatingly, staggeringly.    From Wordnik.com.  [Rational Review] Reference