Supervising a lazy BSc student I am a PhD student and  I have to supervise two BSc students in conducting their thesis. Unfortunately, I am very (very!) frustrated with one of them.
First of all, this specific student doesn't show up in our arranged Skype meetings (without prior notice). The first time we (finally!) managed to discuss his project he seemed to have no idea of what he needs to do. I asked him his ideas about possible projects and obviously, he had not bothered to devote some time to this  (please note that our first meeting took place two months after the beginning of the semester which is plenty of time to decide on a research subject). I advised him to choose a subject he likes and read a lot of papers to develop his research questions and he asked me what a research question is!
But the worst thing is that he shows no motivation to work on his project. For example, he expects ME to develop the subject as well as the research questions. I certainly don't want to tell him what to do. However, I am worried that a possible failure in his project will indicate that I am an incompetent supervisor.
What should I do with this lazy student?
Things like that happen. (Also, as mentioned in the comments, you might be wrong on the reason of their behaviour.)
Close mentoring

Assign meetings, say, weekly.
Make it very clear, you want to see some progress each meeting.
Steer the student in the right direction in each meeting.

You'd need to define their topic, the extent of work, etc. early on. No freedom, no &quot;choose your own topic&quot; – it's already too late for this. Pick one, make sure the student is Ok with it, say &quot;go&quot;.
What I also tend to do after the topic definition: Elaborate on the amount of work. &quot;If you do this, this, this, and this, it's an A&quot;, &quot;if you do only this, it's an F, I need at least that and this additionally to let you pass.&quot; Notice, that &quot;having written the actual thesis at least okay'isch&quot; is one of those things they need to pass. Do not forget to mention it!