Serial Complainer
One who complains about everything. Never Happy. Can not be pleased. No matter what you do or anybody else does, they complain. The can not see the positive in anything. If there is a negative they will surely find it!
John complains about everything. He is what's known as a serial complainer. He's had several jobs and he finds something to complain about with every one of them and wants to quit. He complains about nearly every situation in life that he encounters. At first he's happy with the situation then when things go slightly wrong he starts complaining. All he knows how to do is complain about every situation.