Effortlessness (4)
I believe the answer is:
ease
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">effortlessness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(both can mean a lack of difficulty)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ease that I've seen before include "Free from pain" , "Rest and leisure" , "Make comfortable" , "Comfort; simplicity" , "Freedom from pain or anxiety" .)