IDIOMS

bad news

(idiomatic) An irritating, troublesome or harmful person, situation or thing.

Example: News of unpleasant, unfortunate or sad events.
2008, Alex Perry, "Good News: Gorillas Thrive," Time, 5 Aug.,
  One of the rules of journalism is that news from Africa is always bad news.
2008, Lynda Johnson, "Nude Photos: Britney Spears 5150 Leads to Paparazzi Picture Sale," National Ledger, 12 Jan. (retrieved 10 Oct. 2008),
  Many are warning Spears that he is bad news and is trying to use her.