What's the noun for easeful? Here's the word you're looking for.
easement
(law) The legalright to use another person's real property (real estate), generally in order to cross a part of the property, or to gain access to something on the property.
(model railroading) Transition spiral curve track between a straight or tangent track and a circular curved track of a certain radius or selected radius.
“The elegance of the technique and the ease by which it can be applied even by a nonbiochemist have led to a veritable explosion of studies in enzyme variation.”
“The lithe gymnast could handle even the most demanding moves with complete ease.”
“The ease by which he was able to quickly develop a rapport with others was almost uncanny.”