WordWeb Online

1. Tiresomely long; seemingly without end
   "endless debates"; "an endless conversation";
   - eternal, interminable, unending
    
2. Infinitely great in number
   "endless waves"
    
3. Having no known beginning and presumably no end
   "time is endless";
   - dateless, sempiternal
    
4. Having the ends united so as to form a continuous whole
   "an endless chain"

See also: continuous, infinite, long, uninterrupted

Encyclopedia: Endless, Nameless