What does the word nameless mean?

Usage examples for nameless

  1. They had left the trenches the previous night to come on a special mission to Paris, and they seemed to me like men who had been in some torture chamber and suffered unforgettable and nameless horrors. – The Soul of the War by Philip Gibbs
  2. She shrank away from him in nameless terror, gasping and panic- stricken. – The Way of an Eagle by Ethel M. Dell
  3. Probably they still exist as " old and nameless roses" in my own and many other gardens. – Roses and Rose Growing by Rose Georgina Kingsley