olla olevinaan

Finnish

olla (“to be”) + oleva (“active present participle of olla”) + -na (“essive ending”) with a possessive suffix

to feign, fake, pretend
Oppilas oli olevinaan sairas koepäivänään.
The student faked sickness on the day of his exam.
to think or believe to be something
Hän on olevinaan hyvinpukeutuva, mutta minusta hänellä on huono maku.
She thinks to be well-dressed, but I think she's got a bad taste.

See olla; olevinaan is not inflected, but receives a possessive suffix:

Personal/possessive forms for word in phrase
possessor	singular	plural
1st person	olevinani	olevinamme
2nd person	olevinasi	olevinanne
3rd person	olevinaan olevinansa