1. to encourage, promote, or nurture a negative or despairing outlook; to create conditions that lead to hopelessness or doubt
The constant bad news tends to foster pessimism among investors.
As notícias ruins constantes tendem a fomentar pessimismo entre os investidores.
2. to deliberately cultivate or strengthen feelings of despair or lack of hope
Negative propaganda can foster pessimism in the population.
Propaganda negativa pode fomentar pessimismo na população.