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confused (adj.)[confused 词源字典]: early 14c., "discomfited, routed, defeated" (of groups), serving at first as an alternative past participle of confound, as Latin confusus was the past participle of confundere "to pour together, mix, mingle; to join together;" hence, figuratively, "to throw into disorder; to trouble, disturb, upset." The Latin past participle also was used as an adjective, with reference to mental states, "troubled, embarrassed," and this passed into Old French as confus "dejected, downcast, undone, defeated, discomfited in mind or feeling," which passed to Middle English as confus (14c.; for example Chaucer's "I am so confus, that I may not seye"), which then was assimilated to the English past participle pattern by addition of -ed. Of individuals, "discomfited in mind, perplexed," from mid-14c.; of ideas, speech, thought, etc., from 1610s. By mid-16c., the word seems to have been felt as a pure adj., and it evolved a back-formed verb in confuse. Few English etymologies are more confused.[confused etymology, confused origin, 英语词源]
discomfit (v.): c. 1200, as an adjective, from Old French desconfit "vanquished, defeated," past participle of desconfire "to defeat, destroy," from des- "not" (see dis-) + confire "make, prepare, accomplish," from Latin conficere (see confection).

Used as a verb in English from c. 1300. Weaker sense of "disconcert" is first recorded 1520s in English, probably by confusion with discomfort. Related: Discomfited; discomfiting.