pitkänkestoisen

Pitkänkestoisen is the nonstandard or less common form sometimes found in Finnish writing for indicating a long-lasting, durable characteristic. The normative form is pitkäkestoisen, which is the genitive singular of the adjective pitkäkestoinen, meaning long-lasting or durable. The base combines pitkä (long) and kesto (duration) with the suffix -inen, yielding the adjective pitkäkestoinen and its inflected forms.

Etymology and form: The word is built from Finnish elements pitkä and kesto, attached with the adjectival suffix -inen. When declined, the genitive singular takes the form pitkäkestoisen; some writers may mistakenly render the form as pitkänkestoisen or pitkänkestoisen, but pitkäkestoisen is the standard inflection in most contemporary texts. The divergence arises from solidifying the two stems in different orthographic interpretations.

Usage: pitkäkestoisen (standard: pitkäkestoisen) is used to describe objects, processes, or conditions that endure for an extended time. It appears in technical or descriptive prose, product labeling, marketing, and linguistic discussions about Finnish morphology. In everyday language, speakers often use synonyms such as pitkäaikainen or kestävä to convey similar ideas.

Examples (standard form): pitkäkestoisen tuotteen elinikä, pitkäkestoisen lääkeaineen vaikutus, pitkäaikainen suunnitelma. Note that phrases should preserve the standard genitive longa form pitkäkestoisen tuotteen rather than nonstandard variants.

See also: longevity, durability, long-lasting, Finnish grammar.