Unknown. Relationship to Old High German runsa (“running water, stream”) has been proposed, but this is semantically distant, especially considering the Karelian and Ludic cognates runsas, ruznaz, meaning "sizable". Given that rusnas is found in Karelian too, *rusnas is probably original, and a similar metathesis as with känsä took place in Finnish.
runsas (comparative runsaampi, superlative runsain)
Inflection of runsas (Kotus type 41/vieras, no gradation) | |||
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nominative | runsas | runsaat | |
genitive | runsaan | runsaiden runsaitten | |
partitive | runsasta | runsaita | |
illative | runsaaseen | runsaisiin | |
singular | plural | ||
nominative | runsas | runsaat | |
accusative | nom. | runsas | runsaat |
gen. | runsaan | ||
genitive | runsaan | runsaiden runsaitten runsastenrare | |
partitive | runsasta | runsaita | |
inessive | runsaassa | runsaissa | |
elative | runsaasta | runsaista | |
illative | runsaaseen | runsaisiin runsaihinrare | |
adessive | runsaalla | runsailla | |
ablative | runsaalta | runsailta | |
allative | runsaalle | runsaille | |
essive | runsaana | runsaina | |
translative | runsaaksi | runsaiksi | |
abessive | runsaatta | runsaitta | |
instructive | — | runsain | |
comitative | — | runsaine |