Perustelluiksi

Perustelluiksi is a Finnish inflected form that appears in linguistic discussions as a translative plural of a participle or adjective stem related to the verb perustella (to justify) and the noun perustelu (justification). In practice the form is rarely used in everyday speech and is most often analyzed in grammar contexts to illustrate how Finnish expresses a change of state toward being justified or turned into justified reasons.

Morphology and sense. The core stem is perustell-, which carries the sense of providing justification or ensuring that something is well-grounded. The translative case marks a change of state, so perustelluiksi would roughly correspond to “into justified ones/ones that have become justified” in plural usage. In singular, a closely related form is perustelluksi, used to express “to become justified.” The exact surface form can vary with surrounding morphology, but perustelluiksi is typically described as the plural translative.

Etymology. The word comes from the verb perustella (to justify) and the noun perustelu (justification), with standard Finnish translative morphology applied to form the plural ending. The appearance of -lluiksi is a predictable alternation in translative plural for stems ending in -ell-.

Usage. The form is predominantly encountered in grammar notes, linguistic analyses, or theoretical writing rather than in ordinary prose. It can appear in sentences such as “Nyt ne väitteet on esitetty perustelluiksi syiksi” meaning “Now those claims have been presented as justified reasons.”

See also. perustelu, perustella, translatiivi, Finnish grammar, participles.