Difference between Pessimistic and Optimistic

PESSIMISTIC vs OPTIMISTIC: ADJECTIVE

Expecting the best in all possible ways.
Hopeful; sanguine.
Of or pertaining to optimism; tending, or conforming, to the opinion that all events are ordered for the best.
Expecting the best
Expecting the best in this best of all possible worlds

Of, pertaining to, or characterized by optimism; disposed to take the most hopeful view of a matter; hopeful; sanguine.

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

Satisfied, Convinced, Confident, Hopeful, Pessimistic, Starry eyed, Rose colored, Affirmative, Cheerful, Pollyannaish, Positive, Rosy, Bullish, Upbeat, Sanguine

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

Satisfied, Convinced, Confident, Hopeful, Pessimistic, Starry eyed, Rose colored, Affirmative, Cheerful, Pollyannaish, Positive, Rosy, Bullish, Upbeat, Sanguine

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.

Pandemic experts are starting to sound increasingly optimistic.
Correcting for optimistic prediction in small data sets.
Still, ultimately he is guardedly optimistic about mechanism.
Studies conducted in humans show less optimistic findings.
This is an optimistic skyline of New York.
These results are related to the hypothesis of optimistic bias, which states that drinkers are overly optimistic about probabilities of adverse consequences from drink.
In an optimistic locking session, you must take responsibility for coherence and consistence by following an optimistic locking protocol.
SD, through the slightly optimistic last observation carried forward method, to the optimistic complete case analysis.
Are you more optimistic or less optimistic than you were a month ago?
That was idealistic and optimistic, a way too optimistic hope.