ENGLISH
REFERENCE

pessimism

n.
C1 Advanced US //ˈpɛsəˌmɪzəm// UK //pˈɛsɪmˌɪzəm// pes·simism

n. the belief that things will not go well in the future. In computing, it describes a system that assumes the worst will happen and prepares for it.

n. the tendency to expect the worst possible outcome. In a technical context, it refers to a design philosophy where systems are built to handle the most severe failure scenarios.


SIMPLE

The system uses pessimism to prevent data loss.

CONTEXTUAL

By adopting a pessimism approach, the software ensures that even if one server fails, the network remains fully operational.

COMPLEX

The architect argued that a pessimism strategy was essential for the cloud infrastructure, as it accounted for potential hardware failures and network latency without requiring constant manual intervention.

Antonyms
Origin

From French pessimisme, from Latin pessimus (“worst”) + -ism, superlative of malus (“bad”). As a doctrine, from German Pessimismus as used by the German philosopher Arthur Schopenhauer in 1819.

© 2026 English Reference