leikillisissä

Leikillisissä is a Finnish word form: the inessive plural of the adjective leikillinen, meaning "playful" or "facetious." As an inflected adjective it denotes location, state or manner within plural referents and is typically translated as "in (the) playful ones," "in playful contexts," or "among playful ..."

The word is formed from the noun leikki ("play") with the adjectival suffix -llinen, yielding leikillinen, and the case ending -issä for the inessive plural. In Finnish adjectives agree with the nouns they modify in number and case, so leikillisiä (partitive plural), leikilliset (nominative plural) and leikillisissä (inessive plural) are related forms.

In use, leikillisissä commonly appears in phrases such as leikillisissä sävyissä ("in playful tones") or leikillisissä piireissä ("in playful circles"), where it qualifies a plural noun in a locative or figurative sense. It occurs across registers, including everyday speech, journalism and literary description, when indicating a playful mood, manner, or setting among multiple items or people.

Because leikillisissä is an inflected form rather than the citation form, descriptive entries about meaning and morphology typically treat leikillinen as the headword and list leikillisissä among its case forms.