Croaker

There are croakers in every country, always boding its ruin.

Source: wiktionary

It is thought by many, and said by some, that this Republic has already seen its best days; that the historian may now write the story of its decline and fall. Two classes of men are just now especially afflicted with such forebodings. The first are those who are croakers by nature – the men who have a taste for funerals, and especially national funerals. They never see the bright side of anything, and probably never will.

Source: wiktionary

Nor did the croakers have long to wait. The second night after the drowning of the mate the little yacht was suddenly wracked from stem to stern.

Source: wiktionary

"It is my advice," the speaker continued, "that we go easier upon the small men. On the day that they have all been driven out the power of this society will have been broken." Unwelcome truths are not popular. There were angry cries as the speaker resumed his seat. McGinty rose with gloom upon his brow. "Brother Morris," said he, "you were always a croaker..."

Source: wiktionary