Noun

1. The truth, reality, the real thing.

   • If not the subject of the clause, this is declined very infrequently in most cases, excluding few cases, some of which could be considered adverbs that are used in verb phrases:

   näyttää toteen = to prove.

   olla totta = to be true.

   ottaa todesta = to take seriously.

   todella = really, very.

   toden teolla = really.

   toden tullen = if push comes to shove, if things really get tough.

   tosiaan = really. (tosia + possessive suffix -an > -nsa)

   tosin = (it's) true.

   Hän on tosin viisaampi.

   True, s/he is wiser.

   tosissaan = serious(ly).

Adjective

1. True.

   • If used in the meaning "true", this is used mostly in the nominative case (basic form) as a copula (with the verb olla).

   Tämä on tosi!

   This is true! / I mean it/business!

2. Real, serious.

   • If used in the meaning "real, serious", this is used as an attribute or as a modifier in a compound term.

   ryhtyä tositoimiin = to take serious action.

   tosiasia = a fact

Verb