INDECO'RUM, noun [Latin in and decorum.] Impropriety of behavior; that in behavior or manners which violates the established rules of civility, or the duties of respect which age or station requires; an unbecoming action. It is sometimes synonymous with indecency; but indecency, more frequently than indecorum is applied to words or actions which refer to what nature and propriety require to be concealed or suppressed.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.