Learner's definition of PESSIMISM
a feeling or belief that bad things will happen in the future
a feeling or belief that what you hope for will not happen
She has expressed pessimism over the outcome of the trial. [=she thinks the outcome will be bad]
Although the economy shows signs of improving, a sense of pessimism remains.
He expressed his pessimism about politics and politicians. [=his belief that politics and politicians are generally bad]