He lets them know that he is not going with them into Mirkwood. They beg and plead with him to go with them. He has business that has to be taken care of elsewhere.
The verb disappoint has the participle adjectives disappointing (disappointing news) and disappointed(disappointed fans). The present participle (disappointing) is also used as a noun. It does not seem to work as an adjective for "people who disappoint."
The news received by Gandalf was that the Gobin armies and Wargs were joinding forces or getting together.
He wasn't going to come to maycomb for one of the summers
receiving disappointing news, experiencing a rejection, or facing a setback or failure.
The population of News-Transcript Group is 460.
News-Transcript Group was created in 1986.
Area News Group was created in 2004.
The News Media Group was created in 2008.
After receiving the disappointing news, her expression turned glum as she quietly left the room.
I give excellent news with a smile.
Plastics News Global Group was created in 2007.
The group that shared news among colonies was the committees of correspondence. With this group they were able to share news much more quickly.