1806: Aggressive Mood (Finnish Grammar) Nov 24, 2019

Finnish grammar is known for having many different cases (about 15 for nouns) and moods for verbs. Some are fairly normal across languages, but the aggressive mood stands out in Finnish as it is little-studied and possibly unique. This is when the negative auxiliary is omitted in a construction that still has the negative form of the verb. This is used both colloquially and non-colloquially, and only really would be possible works in heavily inflected languages. Often, an obscenity is used to replace the negative auxiliary too, which is why it is deemed especially as slang, and understudied.