discourteously

In impolite fashion

In a rude or impolite manner, showing lack of consideration for others: He discourteously interrupted her mid-sentence.

The word carries a slightly formal tone—you might describe someone's behavior as discourteous in a complaint letter rather than casual conversation.

rude

rudely

Without proper courtesy

curtly · bluntly · gruffly · churlishly · boorishly · ungraciously · tactlessly · offhandedly · abruptly · insensitively

contemptuous

disrespectfully

In a rude manner

derisively · sneeringly · mockingly · condescendingly · disparagingly · belittlingly · demeaningly · insolently · haughtily · superciliously

harsh

harshly

In severe manner

acerbically · cuttingly · bitingly · sharply · tartly · sarcastically · sardonically · scathingly · stingingly · witheringly

Opposites
manner of social conduct

discourteouslycourteously

With good manners

politely · graciously · respectfully · civilly · considerately

Family

discourteous

Familiarity
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Used worldwide · Timeless · Abstract · Negative · Everyday, not technical · Rated G