mutaisella
Mutaisella is the adessive singular form of the Finnish adjective mutainen, meaning muddy. In usage, mutaisella describes the surface condition of a noun and indicates that something is on or located on a muddy surface, as in phrases like mutaisella tiellä or mutaisella pihalla. The form is typically seen when the associated noun is in the adessive case.
Etymology and morphology: mutainen is formed from muta (mud) with the adjectival suffix -inen. The adessive singular
Usage notes: Mutaisella is common in descriptive writing and everyday speech when specifying conditions of terrain
See also: mutainen, Finnish adjectives, Finnish grammar, adessive case.
In summary, mutaisella is the grammatical form used to say “on the muddy [surface]” in Finnish, arising