From <span class="searchmatch">veiling</span> + -ly. <span class="searchmatch">veilingly</span> (not comparable) So as to veil or cover. 1858, John Saunders, Westland Marston, The National Magazine, volume 3, page 133:...
first gray light of dawn he arose; and before drawing the white sheet <span class="searchmatch">veilingly</span> over, he took a last farewell look at that angel face. parting, valedictory...