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immodest (adj.)[immodest 词源字典]: 1560s, "arrogant, impudent, pretentious," from Latin immodestus "unrestrained, excessive," from assimilated form of in- "not, opposite of" (see in- (1)) + modestus (see modest). Meaning "indecent" is from 1580s. Related: immodestly.[immodest etymology, immodest origin, 英语词源]
modest (adj.): 1560s, "having moderate self-regard," from Middle French modeste (14c.), from Latin modestus "keeping due measure" (see modesty). Of women, "not improper or lewd," 1590s; of female attire, 1610s. Of demands, etc., c. 1600. Related: Modestly.