Antonyms of adv courteously

1 sense of courteously

Sense 1
politely, courteously -- (in a polite manner; "the policeman answered politely, `Now look here, lady...'")
       Antonym of discourteously (Sense 1)
      => impolitely, discourteously, rudely -- (in an impolite manner; "he treated her impolitely")

Synonyms of adv courteously

1 sense of courteously

Sense 1
politely, courteously -- (in a polite manner; "the policeman answered politely, `Now look here, lady...'")