Finnish word oikullinen comes from Finnish -llinen, Finnish oikku (Quirk, whim, fancy, freak, caprice, vagary.)

Detailed word origin of oikullinen

Dictionary entry	Language	Definition
-llinen	Finnish (fin)	Forms adjectives that indicate likeness.. Forms adjectives that indicate possession or relationship.. Forms adjectives that indicate time.. Forms nouns that define a person through his characteristics or possessions.. Forms nouns that indicate an amount.
oikku	Finnish (fin)	Quirk, whim, fancy, freak, caprice, vagary.
oikullinen	Finnish (fin)	Whimsical, capricious.

Words with the same origin as oikullinen