Words from
fallow
    left unploughed and unsown for a period, in order to restore its fertility.
    
    Source: Anarchy, State, and Utopia - Robert Nozick
    
    
      (of a period of time) characterized by inaction; unproductive.
    
    
  “Our language, one of our most precious natural resources, deserves at least as much protection as our woodlands, streams and whooping cranes.”- James Lipton