411 REFERENCE · Wiktionary
-isuus
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
Finnish
Etymology
fi -inen -uus; probably by analogy with the numerous fi -uus nouns derived from adjectives ending in fi -inen.
Suffix
noun isyys
Forms nouns from past active participles, adjectives ending in fi -ias/fi -iäs and occasionally other adjectives.
fi kuollut dead kuolleisuus death rate
fi estynyt prevented -isyys estyneisyys prevented-ness
fi uupunut exhausted, tired uupuneisuus exhaustedness, tiredness
fi antelias generous anteliaisuus generousness
Usage notes
Many more nouns ending in fi -isuus/-isyys are simply derived with fi -uus -uus/-yys from adjectives ending in fi -inen, which are plenty. fi -isuus/-isyys is only used directly with past active participles (fi -nut), adjectives ending in fi -ias -ias/-iäs, some adjectives ending in fi -las -las/-läs, and rarely other adjectives.
Declension
-isuu a
Derived terms
fi
Further reading
178 Mitä U:n edellä: kauneus, alttius, lapsuus, katoavaisuus