What is the meaning of the word "unrenewable"?

Definitions:

  1. Existing in limited quantities that cannot be replaced after they have all been used. copy to clipboard ADJECTIVE
    • Oil, natural gas, and coal are unrenewable fuels. copy to clipboard
  2. Used to describe resources or materials that cannot be replenished or restored once they are used up. copy to clipboard ADJECTIVE
    • Scientists are exploring ways to make the most efficient use on unrenewable resources while developing sustainable alternatives. copy to clipboard

Synonyms: