endless

UK: /ˈɛndləs/ US: /ˈɛndlɪs/ ,(end′lis)

WordReference Random House Learner's Dictionary of American English © 2026

end•less /ˈɛndlɪs/   adj. 

1. having or seeming to have no end;
   boundless:
   an endless highway through the open desert.
2. not stopping or ceasing;
   incessant:
   the endless noise of construction work.

end•less•ly, adv. 
end•less•ness, n. [uncountable]
Synonyms

See eternal.

WordReference Random House Unabridged Dictionary of American English © 2026

end•less  (end′lis), adj. 

1. having or seeming to have no end, limit, or conclusion;
   boundless;
   infinite;
   interminable;
   incessant:
   an endless series of complaints; Time is endless.
2. made continuous, as by joining the two ends of a single length:
   an endless chain or belt.

• Middle English endelees, Old English endelēas. See end¹, -less bef. 900

end′less•ly, adv. 
end′less•ness, n. 
Synonyms

• 1. limitless, illimitable, unending, unceasing, continuous, perpetual. See eternal. 

Collins Concise English Dictionary © HarperCollins Publishers::

endless / ˈɛndlɪs/ adjective

1. having or seeming to have no end; eternal or infinite
2. continuing too long or continually recurring
3. formed with the ends joined: an endless belt

ˈendlessness noun