This is the 578th most frequent Finnish word.
kerrottu
"Repeated" or "told."
Used as past participle, passive voice, indicating an action completed by someone.
Tämä tarina on kerrottu monta kertaa.
This story has been told many times.
Used nominally to refer to 'that which has been told', emphasizing the outcome of the action.
Muista, että kaikki kerrottu ei ole totta.
Keep in mind that everything told is not true.
Here, 'kerrottu' is the past participle of the verb 'kertoa' (to tell) and is used in the passive form to indicate that the action (telling the story) was carried out by an undefined agent.