endlessly

adverb

1. continuing forever without end

   adv.all

   Synonyms infinitely

   Antonyms finitely

   Source: WordNet 3.0

2. with unflagging resolve

   adv.all

   Synonyms ceaselessly continuously incessantly unceasingly unendingly

   Source: WordNet 3.0

3. (spatial sense) without bounds

   adv.all

   Examples

   The Nubian desert seemed to stretch out before them endlessly.

   Source: WordNet 3.0

4. all the time; seemingly without stopping

   adv.all

   Examples

   Her nagging went on endlessly.

   Synonyms interminably

   Source: WordNet 3.0

5. In an endless manner.

   adverb

   Source: webster1913