unveränderlich

Unveränderlich is a German adjective meaning "unchangeable" or "immutable." It is used to describe properties, states, or quantities that remain constant under specified conditions. The term signals absoluteness or necessity rather than variability and is common in scientific, mathematical, philosophical, and formal contexts.

Grammatically, unveränderlich is formed from the prefix un- (negation) and veränderlich ("changeable"), with the suffix -lich. It is somewhat formal in everyday language; more common synonyms include konstant, fest or unverändert, depending on context. It typically refers to intrinsic characteristics that do not depend on temporary circumstances.

In computer science and mathematics, the term corresponds to immutable data: values that cannot be modified after creation. German technical texts often use unveränderliche Datenstrukturen or unveränderliche Objekte to distinguish from mutable ones. In natural science, unveränderlich may describe constants or invariants that do not vary under specified conditions.

Originating from unver- and verändern, the word also relates to terms such as Veränderung (change), veränderlich (changeable), and unverändert (unchanged). In philosophical usage, unveränderliche Eigenschaften are discussed as essential properties that remain the same across contexts.