What does the word groundless mean?

Usage examples for groundless

  1. This idea, however, is groundless. – Illustrative Anecdotes of the Animal Kingdom by Samuel Griswold Goodrich
  2. They informed them that they had been influenced by groundless suspicions, and that the Romans saw no reason why they should inflict punishment upon them. – The History of Rome; Books Nine to Twenty-Six by Titus Livius
  3. But their fears were groundless. – History of Modern Europe 1792-1878 by C. A. Fyffe