1. An indication, signal, or evidence that demonstrates a negative or hopeless outlook about future events or outcomes
The declining sales figures are a sign of pessimism in the market.
Os números de vendas em declínio são um sinal de pessimismo no mercado.
2. A visible manifestation or symptom that reflects doubt, despair, or lack of confidence about a situation
His gloomy expression was a sign of pessimism about the project's success.
Sua expressão sombria era um sinal de pessimismo sobre o sucesso do projeto.