The Collaborative International Dictionary of English v.0.48:
Indefatigably \In`de*fat"i*ga*bly\, adv. Without weariness; without yielding to fatigue; persistently. --Dryden. [1913 Webster]WordNet (r) 3.0 (2006):
indefatigably adv 1: with indefatigable energy; "she watched the show indefatigably" [syn: indefatigably, tirelessly, inexhaustibly]