Taeyeon for sure. And that isn't a bad thing. Its actually super cute. She's know for never leaving her house when she doesn't have to do anything. Thats why she is called the "House Fairy." I love that about her. If she has nothing to do, why not just spend it indoors without doing anything.
1 Jessica - I'm sure and also she loves sleeping alot than anything .
I actually noticed that the oldest members in Snsd , which is Taeyeon,Jessica,Sunny,Tiffany and Hyoyeon were that I think ,lazy .. And hey I'm not being mean because they are all my favorite and I love them all ! I also think that the maknaes were not that lazy ..