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"depressed at heart," 1580s, past participle adjective from deject. Related: Dejectedly (1610s).
early 15c., "to throw or cast down," from Old French dejeter (12c.), from Latin deiectus "a throwing down, felling, fall," past participle of deicere "to cast down, destroy; drive out; kill, slay, defeat," from de- "down" + -icere, comb. form of iacere "to throw" (see jet (v.)). Originally literal; the sense of "depress in spirit" is c.1500.