Seemingly polite but actually rude; courtesy that conceals insolence or sarcasm.
上司に対して慇懃無礼な言い方をする部下に腹が立った。
I was angry at the subordinate who spoke to the boss in a politely rude way.
慇懃無礼な対応は、かえって関係を悪化させることがある。
A superficially polite but rude response can actually make relations worse.
彼女の慇懃無礼な皮肉に、周りの人は気まずい沈黙に包まれた。
People around were wrapped in an awkward silence at her politely rude sarcasm.