Improper
来自Big Physics
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late Middle English: from French impropre or Latin improprius, from in- ‘not’ + proprius ‘one's own, proper’.
wiktionary
From Middle French impropre, from Latin improprius(“not proper”), from in- + proprius(“proper”).
etymonline
improper (adj.)
mid-15c., "not true," from Old French impropre (14c.) and directly from Latin improprius "not proper," from assimilated form of in- "not, opposite of" (see in- (1)) + proprius (see proper). Meaning "not suited, unfit" is from 1560s; that of "not in accordance with good manners, modesty, or decency" is from 1739. Related: Improperly (late 14c.).
