rude
    Don't mention it.
    you're welcome
    impolite
    blunt
    malapert
    candidness
    immodesty
    incivility
    你明天不把錢還給我，我就不客氣了。
    I pity you (ie I am threatening you) if you can't pay me the money by tomorrow.
    如果你需要什么東西，請不客氣地對我說。
    In case you need something, please don't hesitate to let me know.
    那位顧客對女店員不客氣的回答感到忿怒。
    The customer was angry with the salesgirl for her impolite answer.