athirst vs thirsty

athirst

adj
  • Eager or extremely desirous (for something). 

thirsty

adj
  • Desiring sex. 

  • Causing thirst; giving one a need to drink (informal). 

  • Needing to drink. 

  • Craving something. 

noun
  • Thirst. 

  • One who is thirsty (for a drink, sex, alcohol, etc.). 

How often have the words athirst and thirsty occurred in a corpus of books? (source: Google Ngram Viewer )