Polish spelling rules for the word 'nieaktualne' (outdated/invalid)

In Polish orthography, the correct spelling of the word meaning outdated or invalid is typically the compound form "nieaktualne." According to grammatical rules, the particle "nie" is written together with adjectives in the positive degree.

This compound form is appropriate for most everyday contexts, official communications, and descriptions involving information, data, terms, or advertisements that are no longer valid. A simple way to verify the correct spelling is to check if the word can be replaced by "przestarzałe" (outdated) or "nieważne" (invalid); if it can, the joined spelling is correct.

The separate spelling "nie aktualne" is rare and is only used when a sentence specifically emphasizes a direct contrast or a strong logical negation. For example, in a construction like "To nie aktualne, lecz archiwalne" (This is not current, but archival), the separate spelling serves to highlight the opposition between terms.