työstettävän
työstettävän is the genitive singular form of the Finnish word työstettävä. The word työstettävä itself is a passive participle of the verb työstää, meaning "to work on," "to process," or "to refine." Therefore, työstettävän indicates something that is to be worked on, processed, or refined, and it is in the genitive case, which often denotes possession, origin, or a part of something.
In practical usage, työstettävän would typically appear in a sentence describing a noun that is the object