Adverb
1. continuing forever without end;
"there are infinitely many possibilities"2. with unflagging resolve;
"dance inspires him ceaselessly to strive higher and higher toward the shining pinnacle of perfection that is the goal of every artiste"3. (spatial sense) seeming to have no bounds;
"the Nubian desert seemed to stretch out before them endlessly"4. all the time; seemingly without stopping;
"a theological student with whom I argued interminably""her nagging went on endlessly"