jäykkojen
Jäykkojen is a Finnish word-form that appears as the genitive plural of a stem jäykko, a term that is not common in standard Finnish. In Finnish, genitive plural endings convey possession or relational meaning, so jäykkojen would be used to refer to something associated with several stiff or rigid things or people. Because the base meaning of jäykko is not widely attested in everyday language, the exact sense of jäykkojen depends on context and the surrounding nouns.
Grammatical notes: Jäykkojen is formed with the genitive plural ending -en (often realized as -jen) attached
Usage: The term is uncommon in everyday language and is more likely to appear in dialect writing,