I am asking this question to seek some perspectives from graduate advisors.
My question is: what qualities of a student makes him or her difficult to supervise? It is all the more valuable if this is based on actual experience.
Note that "difficult" is open to interpretation. The student may not necessarily be a bad student or poor learner; after all, most of the people who are admitted to a graduate program has went through some rigorous examinations in their lives. Maybe a student is such a genius, that he/she won't listen to you, and hence that presents a difficulty.