pessimistic(marked by pessimism and little hopefulness) adjective [UK: ˌpe.sɪ.ˈmɪ.stɪk] [US: ˌpe.sə.ˈmɪ.stɪk]
pesimistanoun {m} {f}
pessimist [pessimists](someone who habitually expects the worst outcome) noun [UK: ˈpe.sɪ.mɪst] [US: ˈpe.sə.məst]I'm not pessimistic. = No soy pesimista.