inessiivisenadessiivisen

Inessiivisenadessiivisen is not a standard term in Finnish grammar. It is a concatenation of two genitive forms of adjectives, namely inessiivinen (inessive) and adessiivinen (adessive), when these adjectives modify a common noun in the same phrase. The form itself is not traditionally treated as a single lexical item, but as evidence of how Finnish adjectives decline to agree with the noun they describe.

In Finnish, adjectives decline like nouns and take the same case endings as the noun they modify. The adjectives inessiivinen and adessiivinen have genitive singular forms inessiivisen and adessiivisen, respectively. When both adjectives modify the same noun, they are usually written with a space (or connected by ja) before the noun, for example inessiivisen adessiivisen käytön, meaning “the use of the inessive and the adessive.” The standard orthography does not typically fuse them into a single word.

Usage-wise, combining multiple adjectives before a noun is common in Finnish, but writers generally keep each adjective separate to preserve readability. The genitive forms indicate that the noun they modify is in another noun’s possession or relation, as in “use of X” or “differences in Y’s usage.” Therefore, phrases that conceptually refer to both cases often appear as inessiivisen ja adessiivisen käytön or with other linking devices rather than as a single fused term.

In summary, inessiivisenadessiivisen is more a description of a morphological possibility than a recognized standalone term in Finnish grammar; proper practice is to keep the two adjectives separate and agree with the noun they modify.