DISCOURTEOUSLY
impolitely, discourteously, rudely
(adverb) in an impolite manner; “he treated her impolitely”
Source: WordNet® 3.1
Etymology
Adverb
discourteously (comparative more discourteously, superlative most discourteously)
In a discourteous manner.
Source: Wiktionary
DISCOURTEOUS
Dis*cour"te*ous (; see Courteous, 277), a. Etym: [Pref. dis- +
courteous: cf. OF. discortois.]
Definition: Uncivil; rude; wanting in courtesy or good manners;
uncourteous.
– Dis*cour"te*ous*ly, adv.
– Dis*cour"te*ous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition