(spatial sense) without bounds; "the Nubian desert seemed to stretch out before them endlessly"
all the time; seemingly without stopping; "a theological student with whom I argued interminably"; "her nagging went on endlessly" Synonym(s):interminably, endlessly
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Endlessly \End"less*ly\, adv.
In an endless manner.