[1] : The Collaborative International Dictionary of English v.0.48

endless \end"less\, a. as. endele'as. 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.
      1913 webster

   2. infinite; excessive; unlimited. --shak.
      1913 webster

   3. without profitable end; fruitless; unsatisfying. r. "all
      loves are endless." --beau.  fl.
      1913 webster

   4. void of design; objectless; as, an endless pursuit.
      1913 webster

   5. having a linear or ribbonlike form with the two ends
      connected together, such as in a circle, ellipse, torus,
      or any other closed loop. belts or chains used in drive
      mechanisms are considered endless in this sense. see
      endless chain.
      pjc

   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.
        1913 webster
see also:
end endless chain endless chain endless screw screw 

[2] : WordNet (r) 2.0

endless
     adj 1: tiresomely long; seemingly without end; "endless debates";
            "an endless conversation"; "the wait seemed eternal";
            "eternal quarreling"; "an interminable sermon" syn: eternal,
             interminable
     2: infinitely great in number; "endless waves"
     3: having no known beginning and presumably no end; "the
        dateless rise and fall of the tides"; "time is endless";
        "sempiternal truth" syn: dateless, sempiternal
     4: having the ends united so as to form a continuous whole; "an
        endless chain"
     5: occurring so frequently as to seem ceaseless or
        uninterrupted; "a child's incessant questions"; "your
        perpetual or continual complaints" syn: incessant, perpetual
see also:
eternal interminable dateless sempiternal incessant perpetual 

[3] : Moby Thesaurus II by Grady Ward, 1.0

133 moby thesaurus words for "endless":
   ageless, all-comprehensive, all-inclusive, amaranthine,
   articulated, boundless, catenated, ceaseless, coeternal,
   concatenated, connected, constant, continual, continued,
   continuing, continuous, countless, cyclical, dateless,
   de longue haleine, deathless, direct, eternal, eterne, ever-being,
   ever-durable, ever-during, everlasting, everliving, exhaustless,
   extended, extending everywhere, featureless, filled out, gapless,
   illimitable, illimited, immeasurable, immediate, immemorial,
   immense, immortal, incalculable, incessant, incomprehensible,
   indefinite, indestructible, inexhaustible, infinite,
   infinitely continuous, innumerable, interminable, interminate,
   joined, jointless, lengthy, limitless, linked, long,
   long-drawn-out, long-spun, long-winded, longiloquent, measureless,
   monotonous, never-ceasing, never-ending, no end of, nonstop,
   nonterminating, nonterminous, numberless, olamic, overlong, padded,
   perdurable, perennial, periodic, permanent, perpetual, prolix,
   protracted, recurrent, repetitive, round-the-clock, running,
   seamless, sempiternal, serried, shoreless, smooth, spun-out,
   stable, steady, straight, sumless, talkative, termless, timeless,
   twenty-four-hour, unbounded, unbroken, unceasing, uncircumscribed,
   uncounted, undifferentiated, undying, unending, unfathomable,
   uniform, unintermitted, unintermittent, unintermitting,
   uninterrupted, universal, unlimited, unmeasurable, unmeasured,
   unnumbered, unplumbed, unrelenting, unrelieved, unremitting,
   unstopped, untold, verbose, windy, without bound, without end,
   without limit, without measure, without number, wordy

Endless >> E Words
Endless, definition of term: Endless
endless_pag1.html

Endless Loop >> E Words
Endless Loop, definition of term: Endless Loop
endless+loop_pag1.html