Finnish word totuus comes from Finnish -uus (Forms nouns from adjectives, expressing a quality.), Finnish tosi

Detailed word origin of totuus

Dictionary entry	Language	Definition
-uus	Finnish (fin)	Forms nouns from adjectives, expressing a quality.
tosi	Finnish (fin)	(colloquial) really, very The truth, reality, the real thing. Real, serious.. True.
totuus	Finnish (fin)	Truth.

Words with the same origin as totuus