Kestoisella

Kestoisella is a Finnish grammatical form of the adjective kestoisa, meaning durable or lasting. It is the adessive singular form used when the adjective modifies a noun in a manner or state, typically conveying “in a lasting” or “with durability” sense. In practice, kestoisella appears in phrases such as kestoisella tavalla or kestoisella asenteella.

Etymology and morphology: The root kesto- relates to duration or endurance. The suffix -isa creates the adjective kestoisa. When the adjective accompanies a noun in the adessive case, it inflects to -lla, producing kestoisella. This inflection pattern is part of the broader Finnish system where adjectives align with the noun’s case in phrases that express manner, location, or condition.

Usage: The form is most common in descriptive or formal Finnish, often in writing. It is not typically used as a standalone word; rather, it appears with a noun or with a word indicating manner, such as “tapa” or “tavalla.” The more everyday synonyms for lasting quality are kestävää or pitkäkestoinen, but kestoisella retains a slightly more literary or emphatic tone.

Examples:

- Hän suoritti työn kestoisella tavalla, korostaen pitkäjänteisyyttä ja laatua. (He completed the work in a lasting way, emphasizing perseverance and quality.)

- Hän työskentelee kestoisella asenteella, mikä näkyy tuloksissa. (He works with a durable/steadfast attitude, which is evident in the results.)

See also: Finnish grammar, adjectives in Finnish, adessive case, kestoisa, kestävyyden.