Absence of grammatical case changes.

Unchanging form in nouns and adjectives.

Consistency in number regardless of context.

Lack of morphological variation across cases.

Fixed structure irrespective of syntactic role.

**Invariant form**: Words that do not change shape.

**Grammatical constancy**: Stability in meaning across usages.

**Fixed morphology**: Unchanging word structure regardless of context.

**Uniform case usage**: Same grammatical role irrespective of position.

**Static declension pattern**: No variation in inflection for cases/roles.