[bù kè qi]
（使人難堪） be rude to; be hard on; impolite; blunt
put it bluntly
說句不客氣的話
be too rude to sb.
對某人太不客氣
If you go on like this, I won't be so easy on you.
你再如此， 我就要不客氣了。
It is very impolite of you to do so to customers.
你這樣做對顧客太不客氣了。
tell you frankly
不客氣地告訴你