Antonyms of thirsty:
hungry, nonabsorptive, peckish, starved, ravenous, empty, nonabsorbent, supperless, esurient, undesirous, undesiring, sharp-set, famished, empty-bellied, wet, awash, bathed, doused, drenched, dripping, saturated, soaked, soaking, sodden, soggy, sopping, soppy, soused, washed, watered, waterlogged, watery, deluged, drowned, flooded, inundated, overflowed, submerged, swamped, hydrated, damp, dank, humid, moist, casual, incurious, insouciant, nonchalant, unconcerned, uninterested, aloof, detached, disinterested, impassive, stolid, halfhearted, lackadaisical, languid, languorous, lukewarm, spiritless, averse, disinclined, hesitant, loath, reluctant, unwilling, apathetic, indifferent, uneager, unenthusiastic.
Examples of usage:
  1. And Umboo drank the water first, for he was very thirsty.
    "Umboo, the Elephant", Howard R. Garis.
  2. This rascal has kept me waiting until I'm thirsty.
    "Gunman's Reckoning", Max Brand.
  3. Are you very thirsty?
    "The Simpkins Plot", George A. Birmingham.