droughtiest

/ˈdraʊtiɪst/
adjective
  1. Superlative form of droughty: most characterized by drought; the driest or most lacking in rain.
    • The droughtiest part of the continent receives less than an inch of rain per year.
    • This has been the droughtiest summer on record.
    • Farmers in the droughtiest areas have had to abandon their fields.