ENDLESSLY

infinitely, endlessly

(adverb) continuing forever without end; “there are infinitely many possibilities”

endlessly, ceaselessly, incessantly, unceasingly, unendingly, continuously

(adverb) 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”

interminably, endlessly

(adverb) all the time; seemingly without stopping; “a theological student with whom I argued interminably”; “her nagging went on endlessly”

endlessly

(adverb) (spatial sense) seeming to have no bounds; “the Nubian desert stretched out before them endlessly”

Source: WordNet® 3.1

Etymology

Adverb

endlessly (comparative more endlessly, superlative most endlessly)

In an endless manner; continuously without limit.

Synonyms: ceaselessly, incessantly, nonstop, Thesaurus:continuously

Source: Wiktionary

End"less*ly, adv.

Definition: In an endless manner.

ENDLESS

End"less, a. Etym: [AS. endeleás. See End.]

1. Without end; having no end or conclusion; perpetual; interminable;

– applied to length, and to duration; as, an endless line; endless time; endless bliss; endless praise; endless clamor.

2. Infinite; excessive; unlimited. Shak.

3. Without profitable end; fruitless; unsatisfying. [R.] "All loves are endless." Beau. & Fl.

4. Void of design; objectless; as, an endless pursuit. Endless chain, a chain which is made continuous by uniting its two ends.

– Endless screw. (Mech.) See under Screw.

Syn.

– Eternal; everlasting; interminable; infinite; unlimited; incessant; perpetual; uninterrupted; continual; unceasing; unending; boundless; undying; imperishable.

Source: Webster’s Unabridged Dictionary 1913 Edition