epäonnistuttu
Epäonnistuttu is a nonstandard or dialectal Finnish verb form related to the verb epäonnistua, meaning to fail or be unsuccessful. In modern standard Finnish, the common past participle is epäonnistunut and the related noun is epäonnistuminen; epäonnistuttu is rarely attested and is not typically covered in mainstream grammar descriptions. When it does appear, it is usually in older texts or in regional speech, and it is generally avoided in formal writing.
Etymology and form: The form appears to be built from the prefix epä- (not) combined with the
Usage and register: Because epäonnistuttu is uncommon, it is most often found in dialect dictionaries, historical
See also: epäonnistua, epäonnistunut, epäonnistuminen.
References: Kielitoimiston sanakirja; Suomen kielen historia (dialect and historical variants).