Depressed

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late Middle English: from Old French depresser, from late Latin depressare, frequentative of deprimere ‘press down’.

wiktionary

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See the etymology of the corresponding lemma form.

etymonline

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depressed (adj.)

c. 1600, "pressed down, lowered," past-participle adjective from depress (v.). Meaning "dejected, lowered in spirits" is from 1620s.