Part of speech: adjective

Valuable above estimation; exceedingly precious.

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Usage examples "invaluable":

  1. In any event his advice would be invaluable. - "Down the Columbia", Lewis R. Freeman.
  2. The presidente had insisted that the school teacher at Huancito would prove invaluable. - "In Indian Mexico (1908)", Frederick Starr.
  3. Perhaps the housekeeper wanted some fresh meat for dinner, or Uncle James desired a new riding horse; in either case, the services of these men were invaluable. - "Frank Among The Rancheros", Harry Castlemon.