siisteihin

Siisteihin is a Finnish illative plural form of the adjective siisti, meaning "neat" or "clean." It is used when the adjective describes a plural noun and the sentence conveys movement toward or into the described places or states. For example, siisteihin tiloihin means "into clean/tidy spaces" and siisteihin taloihin means "to clean/tidy houses." In practice, siisteihin is not a standalone noun; it is a grammatical form that occurs with a following plural noun.

Grammatical notes: In Finnish, adjectives inflect to agree with the nouns they modify. The illative plural suffix is -iin or -ihin, depending on vowel harmony and the noun’s ending, and the adjective takes the corresponding form to agree with the noun in illative plural. As a result, siisteihin is most commonly observed in written and formal Finnish, often in descriptive or instructional contexts. The form appears when a plural noun is in the illative case and is described by the adjective siisti.

Usage: Siisteihin appears in contexts dealing with cleanliness standards, cleanliness campaigns, or travel writing describing environments characterized as neat or clean. It typically occurs as part of a larger noun phrase (siisteihin tiloihin, siisteihin asuinrakennuksiin) rather than by itself.

Related terms: siisti (clean/neat), illative case, Finnish adjective inflection.