yöllisiä

Yöllisiä is a Finnish adjective form meaning nocturnal or relating to the night. It is the plural partitive form of the adjective yöllinen, which describes things that occur during night hours or have characteristics associated with night-time. The term is commonly used to refer to events, phenomena, or beings that take place or exist at night.

Linguistically, yöllinen is derived from the noun yö (night) with the derivational suffix -llinen, which produces an adjective meaning “night-related.” In Finnish, adjectives of this type decline for case and number, and their partitive plural form is -isiä, yielding yöllisiä. This form is typically used when the described items are indefinite or partitive, as in phrases like yöllisiä tapahtumia (nocturnal events), yöllisiä unia (nocturnal dreams), or yöllisiä olentoja (nocturnal beings).

Usage and nuance: yöllisiä emphasizes the nocturnal aspect rather than general or daytime qualities. It is common in descriptive writing, travel or nature contexts, and literary language to highlight activities or experiences that occur at night. The term can appear in everyday speech when referring to things that happen after dark, especially when the speaker wants to express that multiple items or events are involved.

See also: yö, yöllinen.