What does the word indubitable mean?

Usage examples for indubitable

  1. The last of the three was only a few years younger than Hideyoshi, and had already shown indications of the clear and steady character of which he afterward gave such indubitable proof. – Japan by David Murray
  2. Such is the nature of the human mind, that we all begin in this sphere of equal knowledge, we begin under the dominion of the senses, and whatever comes within that wants no demonstration, wants no proof, wants no logic; it is the constant, it is the most indubitable, it is the most indisputable of all our knowledge. – Modern Atheism under its forms of Pantheism, Materialism, Secularism, Development, and Natural Laws by James Buchanan