Äkilliseen

äkilliseen is the illative singular form of the Finnish adjective äkillinen, meaning sudden or abrupt. The illative case in Finnish generally expresses movement toward or into something, and for adjectives ending in -inen the illative singular typically ends in -iseen. Therefore, äkilliseen is used before a noun in illative case, as in phrases like äkilliseen kuolemaan johtanut onnettomuus (“an accident that led to a sudden death”) or äkilliseen muutokseen liittyvä tilanne (“a situation related to a sudden change”).

Morphology and usage notes:

- Base adjective: äkillinen (sudden)

- Illative singular: äkilliseen (to/into a sudden [something])

- Other common forms include: nominative singular äkillinen, genitive singular äkillisen, partitive singular äkillistä, nominative plural äkilliset, illative plural äkillisiin.

- The illative form is typically used in formal or descriptive contexts, including journalism, legal writing, and medical or technical language, to specify a sudden characteristic of a noun.

Examples:

- Äkilliseen kuolemaan johtanut onnettomuus järkytti kaupunkia. (The accident that led to a sudden death shocked the city.)

- Tutkijat tarkastelivat äkilliseen muutokseen liittyvää dataa. (Researchers examined data related to a sudden change.)

See also:

- Illative case (Finnish grammar)

- Finnish adjectives, especially -inen adjectives and their inflection

- Morphology of Finnish case endings and agreement