[bù kè qi]
(使人难堪) be rude to; be hard on; impolite; blunt
put it bluntly
说句不客气的话
be too rude to sb.
对某人太不客气
If you go on like this, I won't be so easy on you.
你再如此, 我就要不客气了。
It is very impolite of you to do so to customers.
你这样做对顾客太不客气了。
tell you frankly
不客气地告诉你