You can somewhat avoid the danger of generating lists by rewording it to:
For what type of application is Haskell not suitable?
But you have a bigger problem, no expert is going to like talking about the disadvantage of his area of knowledge. Those type of questions tend to get downvoted and closed for any conceivable reason. You need to reword it to invite a positive response:
For what type of application is Haskell particularly suitable?
The kind of question an expert will love to answer. With some luck, he'll expand on the topic and mention some types where Haskell isn't great. If not, you'll have to invert the answer yourself. You definitely need to look for a duplicate, this question has to have been asked by now.