can i delete my discussions that are unresolved?

No, unfortuntely you cannot delete anything..Once they are posted thats it, they stay there forever..No worry though, someone might come across them one day..

Actually no need for you to delete the 'unresolved' discussion. Because it does not means that the discussion you've posted is not attractive. It happened that way because there was a better point of discussion to be attended by other members rather than yours on the time you posted your point. Just repost it as your 'start a new discussion'....inhere it just like 'bait' to fish...