Etymologically speaking, the stupefying source of sad is very satisfying! The word traces back to Old English saed, which meant "fulfilled or satisfied". As weird as this seems, it actually kind of makes sense. One who is satisfied, say by food, will enjoy that comfortable feeling of drowsiness after a good meal. Thus sad started to mean "weary and tired", and since people with depression or great sadness often feel weary, the word came to be applied to the emotion they were experiencing. This is a rare and scintillating instance of a complete about-face in etymology, something pretty scarce in the field. Anyway, saed is generally acknowledged to trace back to the Proto-Germanic word sathaz (or sadaz; this d to th distinction is common in Germanic tongues, and is represented by the symbol ð, which I will avoid to prevent confusion). Sathaz traces to its reconstructed etymon from Proto-Indo-European, seh, both of which meant "satisfied". Seh , incidentally is also the root of Latin satis, which gave today's word, satisfied. This is why linguistics are amazing! You'll never expect these completely shocking origins!
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Hello! I'm Adam Aleksic. This year, I graduated from Harvard University with a degree in Government and Linguistics. There, I co-founded the Harvard Undergraduate Linguistics Society and wrote a thesis on Serbo-Croatian language policy, magna cum laude. In addition to etymology, I also really enjoy trivia, politics, vexillology, geography, board games, conlanging, art history, and law.