suuruisia

Suuruisia is not a standard Finnish word of its own. It is commonly encountered as a nonstandard or erroneous inflected form that some writers or learners produce when trying to decline certain adjectives or words related to size. In practice, it is not listed in contemporary Finnish dictionaries and is rarely accepted as correct in modern usage.

In Finnish, adjectives agree with the nouns they modify and have distinct plural forms. The normal plural partitive form of the adjective meaning “large” is suuria, as in suuria rakennuksia (large buildings). The form suuruisia does not conform to the standard declension patterns for adjectives, and therefore it is not considered a correct or common inflection in standard Finnish.

Possible sources of the confusion include mistaken analogies with other noun or adjective endings, contact with languages that have different plural endings, or typographical errors where -sia or -isia is mistaken for -isia in some contexts. While rare or historical variants may appear in scholarly or archaic texts, suuruisia is not a generally recognized part of Finnish grammar today.

Usage guidance: when you want to describe multiple items as large, use suuria followed by a plural partitive noun, for example suuria rakennuksia or suuria määriä. If you encounter suuruisia in a text, treat it as nonstandard or likely a typo and prefer the standard suuria or other appropriate forms depending on the noun and case.

See also: Finnish grammar, Adjective declension, Partitive case.