Source : Webster's Revised Unabridged Dictionary (1913)

Thirstily \Thirst"i*ly\, adv.
   In a thirsty manner.

Source : WordNet®

thirstily
     adv 1: in a thirsty manner; "we drank thirstily from the bottle
            that was passed around"
     2: with eagerness; in an eager manner; "the news was eagerly
        awaited" [syn: {eagerly}]