Superlative form of droopy; the most inclined to hang down limply or look exhausted and sad.
From 'droopy' with the superlative suffix '-est', which marks the extreme form when comparing three or more things. This suffix dates back to Proto-Germanic.
The superlative '-est' is so old it shows up in almost every language descended from Indo-European, which is why we see it not just in English but in German, Dutch, and Scandinavian languages too!
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