jeremiah (jer-uh-MY-uh) noun
A person who complains continually, has a gloomy attitude, or one who warns about a disastrous future.
[After Jeremiah, a Hebrew prophet during the seventh and sixth centuries BCE who prophesied the fall of the kingdom of Judah and whose writings are collected in the Book of Jeremiah and the Book of Lamentations.]
Today's word in Visual Thesaurus.
"Having been a Jeremiah for so many years, mainly through the pages of the Guardian but also via his own immensely popular website, Monbiot has now turned his mind to what, precisely, can be done to halt global warming."
-- Stephen Price; A Wake-up Call For the Human Race; The Sunday Business Post (Dublin, Ireland); Oct 8, 2006.