-nis f (plural -nissen)
- -niß (obsolete)
Cognate to English -ness, which see for more.
- A suffix for deriving nouns from verbs or adjectives.
-nis f (genitive -nis, plural -nisse)
- A suffix for deriving nouns from from verbs or adjectives, etymologically identical to the preceding.
There is no perfect rule to determine whether a noun with the suffix -nis is neuter (→ suffix 1) or feminine (→ suffix 2). The former may be concrete or abstract, whereas the latter are almost exclusively abstract.