Adjective endless has 5 senses
  1. endless, eternal, interminable - tiresomely long; seemingly without end; "endless debates"; "an endless conversation"; "the wait seemed eternal"; "eternal quarreling"; "an interminable sermon"
    Antonym: short (indirect, via long)
  2. endless - infinitely great in number; "endless waves"
    finite (indirect, via infinite)
  3. dateless, endless, sempiternal - having no known beginning and presumably no end; "the dateless rise and fall of the tides"; "time is endless"; "sempiternal truth"
    Antonym: finite (indirect, via infinite)
  4. endless - having the ends united so as to form a continuous whole; "an endless chain"
    discontinuous, noncontinuous (indirect, via continuous)
  5. incessant, perpetual, endless - occurring so frequently as to seem ceaseless or uninterrupted; "a child's incessant questions"; "your perpetual (or continual) complaints"
    Antonym: sporadic (indirect, via continual)