Examples of usage:

  1. The bank does not extend more than three cables length from the shore; without that, is an unfathomable depth. "A Voyage Towards the South Pole and Round the World, Volume 1" by James Cook
  2. " You shall do as you please," he said, and sat for a moment regarding his only son with unfathomable eyes. "The Passionate Friends" by Herbert George Wells
  3. Set in the centre of the deep blue water of this lake, which we discovered afterwards to be unfathomable, was an island not more than five and twenty or thirty acres in extent, that seemed to be cultivated, for on it we could see fields, palms and other fruit- bearing trees. "Allan and the Holy Flower" by H. Rider Haggard

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