kirkkaisiin
Kirkkaisiin is the illative plural form of the Finnish adjective kirkas, meaning bright. In Finnish, adjectives agree with the nouns they modify in number and case, and the illative plural suffix for adjectives is typically -isiin, producing forms such as kirkkaisiin. The form is most common in descriptive or literary language, where it can indicate movement toward or into something described as bright, or simply describe a plural noun phrase in the illative case.
Kirkkaisiin can modify any plural noun in illative case, for example kirkkaisiin ikkunoihin (to the bright
Kirkkaisiin derives from kirkas with the illative plural suffix -isiin. The form illustrates Finnish adjective inflection:
Finnish grammar, Illative case, Adjective inflection, Finnish adjectives.