The Collaborative International Dictionary of English v.0.48:
Enduring \En*dur"ing\, a. Lasting; durable; long-suffering; as, an enduring disposition. "A better and enduring substance." --Heb. x. 34. -- En*dur"ing*ly, adv. --T. Arnold. -- En*dur"ing*ness, n.WordNet (r) 3.0 (2006):
enduringly adv 1: in an enduring manner; "Roman culture was enduringly fertilized"