Definitions of endless:

• adjective:   tiresomely long; seemingly without end

  Example: "Endless debates"

• adjective:   having the ends united so as to form a continuous whole

  Example: "An endless chain"

• adjective:   infinitely great in number

  Example: "Endless waves"

• adjective:   having no known beginning and presumably no end

  Example: "Time is endless"

• adjective:   occurring so frequently as to seem ceaseless or uninterrupted