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Definition of indecorum : 1. An indecorous or becoming action.
2. Want of decorum; impropriety of behavior; that in behavior or manners which violates the established rules of civility, custom, or etiquette; indecorousness.

Synonyms:

inappropriateness, acquaintance, indecency, familiarity, untowardness, unseemliness, closeness, unbecomingness, impropriety, casualness, autonomy, incorrectness, liberty, improperness, indelicacy, intimacy, indecorousness, usual, conversance, conversancy, indelicateness, shore leave

rudeness, indiscretion, vulgarity

Usage examples:

• Gilles de Retz turned pale, bit his lips, and cast a glance of malignant hate at Pierre de l'Hospital; then, composing his countenance, he spoke with an appearance of calm:- " Messires, I shall not deny that I behaved wrongfully in the case of Jean Rousseau; but, in excuse, let me say that the said Rousseau was full of wine, and he behaved with such indecorum towards me in the presence of my servants, that it was quite intolerable. - "The Book of Were-Wolves", Sabine Baring-Gould.
• Some say that, being boys and bred up together from their infancy, they were always at variance with each other in all their words and actions as well serious as playful, and that in this their early contention they soon made proof of their natural inclinations; the one being ready, adventurous, and subtle, engaging readily and eagerly in everything; the other of a staid and settled temper, intent on the exercise of justice, not admitting any degree of falsity, indecorum, or trickery, no, not so much as at his play. - "Plutarch-Lives-of-the-noble-Grecians-and-Romans", Clough, Arthur Hugh.
• I can now exercise this employment only upon hearsay, or, at most, written evidence; and therefore shall exercise it with great lenity and some diffidence; but when we meet, and that I can form my judgment upon ocular and auricular evidence, I shall no more let the least impropriety, indecorum, or irregularity pass uncensured, than my predecessor Cato did. - "Letters to His Son, 1749", The Earl of Chesterfield.