IPA: /ˈθɜːrstiɪst/
KK: /ˈθɜrstiɪst/
Having the greatest need for water or drink; extremely dry or parched.
After running the marathon, I felt like the thirstiest person in the world.
Comparative: thirstier
Superlative: thirstiest
Thirstiest → It is formed from "thirst" (from Old English "þirst", meaning a strong desire for liquid) and the suffix "-iest" (meaning the most). The word "thirstiest" means having the greatest desire for liquid or being in the most need of hydration.
Think of the Old English word for a strong desire for liquid — that's 'thirst' — and remember that 'thirstiest' means having the most intense need for a drink.