Slippery customer American noun
A person, group, or company that is not worth relying on.
We should be careful with that organization. It is probably a slippery customer.
A person who is difficult to understand or comprehend his or her inner thinking,
Don’t turn yourself into a slippery customer.
An issue or individual which does not have a specific and clear definition.
I don't know how to explain it because it surely is a slippery customer.
Something that only has one of two different end results: positive or negative
To make an issue or situation less clear and less easy to understand
Used to indicate a weak and unreliable support.
people often do irrational or foolish things when they are in love.
I and my boyfriend have decided to get married in the summer. I don't think that's wise, since we won't have enough money saved by then to set up house. But then, one cannot love and be wise.