This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Lack of courtesy; rudeness.

n. A rude act or statement.

n. Lack of courtesy; rudeness.

n. A rude act.

n. Rudeness of behavior or language; ill manners; manifestation of disrespect; incivility.

n. Incivility; rudeness of behavior or language; ill manners.

n. An act of disrespect or incivility.

n. an expression of lack of respect

n. a lack of politeness; a failure to show regard for others; wounding the feelings or others

n. a manner that is rude and insulting

"It cannot be termed discourtesy in Sir Kenneth that, situated as he was, he overheard a conversation in which he found himself deeply interested."

discourteousness   

incivility    impoliteness   

disrespect    impertinence    insubordination    incivility    disesteem    rudeness    irreverence    disloyalty    inurbanity    unkindness