Example : There are infinitely many possibilities.

Synonyms : infinitely

Example : Dance inspires him ceaselessly to strive higher and higher toward the shining pinnacle of perfection that is the goal of every artiste.

Synonyms : ceaselessly, continuously, incessantly, unceasingly, unendingly

Example : The Nubian desert stretched out before them endlessly.

Example : A theological student with whom I argued interminably.
Her nagging went on endlessly.

Synonyms : interminably