01 n. Lack of decorum; impropriety of behavior; that in behavior or manners which violates the established rules of civility, custom, or etiquett…
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1.
Lack of decorum; impropriety of behavior; that in behavior or manners which violates the established rules of civility, custom, or etiquette; indecorousness.
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2.
An indecorous or unbecoming action.
Syn.
Indecorum 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. Indecency is the stronger word; indecorum refers to any transgression of etiquette or civility, especially in public.