Difference between Pessimistic and Bleak

PESSIMISTIC vs BLEAK: NOUN

Any of various small European freshwater fishes of the genus Alburnus, having silvery scales.
A small European river fish (Alburnus alburnus), of the family Cyprinidae.
A small European river fish (Leuciscus alburnus), of the family Cyprinidæ; the blay.
An English name of a small cyprinoid fish, Alburnus lucidus. Other forms of the name are bleik, blick. Also called blay.

Sanguine, Low, Dramatic, Passive, Sombre, Negative, Grim, Downbeat, Bleak, Gloomy, Optimistic, Demoralized, Discouraged, Disheartened, Bearish

Dire, Glum, Grim, Gloomy, Cutting, Black, Raw, Cold, Bare, Inhospitable, Barren, Desolate, Hopeless, Dim, Stark

Sanguine, Low, Dramatic, Passive, Sombre, Negative, Grim, Downbeat, Bleak, Gloomy, Optimistic, Demoralized, Discouraged, Disheartened, Bearish

Dire, Glum, Grim, Gloomy, Cutting, Black, Raw, Cold, Bare, Inhospitable, Barren, Desolate, Hopeless, Dim, Stark

Well, again, I am not at all pessimistic.
I was really negative, and pessimistic, she says.
Experts said the US numbers were "somewhat pessimistic''.
One major hospitality group is even more pessimistic.
His report excited even the most pessimistic observers.
Are you optimistic or pessimistic about the future?
Confucian ideals with a more pessimistic, pragmatic vision.
Chandler, the sarcastic, pessimistic yet charming ladies man.
Reiner was constantly depressed, pessimistic yet very funny.
The most dominant male subject was least pessimistic, and the female most pessimistic.

James Hawkins of accessible from the bleak North.
The situation is pretty bleak on this front.
In this bleak scene the steadfastness of Col.
The future of ASU is looking more bleak.
Things are looking pretty bleak for Michigan State.
He offered a bleak assessment of the industry.
The chances of a peaceful settlement seem bleak.
The weather was perfect - bleak and cold.
Bleak, bleak the east wind sobs and sighs, And drowns the turret bell, Whose sad note, undistinguished, dies Unheard, like my farewell!
The debt outlook is certainly bleak, but it is slightly less bleak than it seemed a few months ago.