yllätyksellisten
Yllätyksellisten is a Finnish linguistic form that occurs as a genitive plural inflection of adjectives in the -inen class describing something as surprising or remarkable. It is not a standalone dictionary entry, but a grammatical ending that appears when an adjective describes a plural noun and the entire noun phrase is put into a genitive construction. A common illustrative phrase is ylittellisten tarinoiden kokoelma, which can be translated as a collection of surprising stories.
In practice, yliö, the form is used in written and formal Finnish, often in descriptive or literary
Etymology and related forms: the base adjective comes from the root meaning “surprising” (such as yllättävä
See also: Finnish grammar, Finnish adjectives, -inen adjectives, genitive constructions.