Kankeiksi
Kankeiksi is a Finnish word form derived from the adjective kankea, meaning stiff or rigid. It represents the translative plural form of that adjective, used to express a change of state into stiffness and is written with the suffix -iksi in plural contexts (the singular form is -ksi).
Grammatically, kankeiksi appears in sentences that describe becoming stiff in a plural sense. It commonly follows
Usage and nuance: kankeiksi can describe physical stiffness, such as muscles or joints becoming less flexible
In Finnish, the translative case (ending in -ksi for singular and -iksi for plural) marks a change
See also: Finnish grammar, translative case, adjectives in Finnish, kankea.