Learn Finnish: Onko oudon näköisellä epäillyllä parta? - Does the strange-looking suspect have a beard?

In this type of descriptive phrase, the first word (outo) is locked in the genitive case to link it to näköinen (looking). When the sentence forces the whole adjective into the adessive case to match the noun, only the second part changes (näköisellä). The genitive modifier oudon stays exactly the same.

Why is oudon näköisellä written as two separate words?

When a regular adjective (like outo) is the genitive modifier for words like näköinen, they are written as two separate words. They are usually only combined into a single compound word if the first part is a pronoun (like samanikäinen or minkäkokoinen).

Why are näköisellä and epäillyllä in the adessive (-llä) case?

This is the Finnish "to have" construction. Because Finnish doesn't have a direct verb for "to have", it puts the owner in the adessive case followed by the verb olla (to be). Literally, the sentence is asking, "Is there on the strange-looking suspect a beard?".

What is the base form of epäillyllä, and why does the middle change?

The base word is epäilty (suspect). When you add the adessive ending -llä, consonant gradation kicks in. The strong -lt- combination in the middle weakens to -ll-, resulting in epäillyllä.