I still can't get over this comment.

I'm glad you enjoyed it

The Mansi one uses a Latin script instead of Cyrillic, so you'll need to look up the Mansi Cyrillic orthography if you want to read Shestalov poems in the original; but it does mark the long vowels, which Balandin doesn't (the standard spelling in 1960 didn't include length yet)

There is indeed such a word

Wiktionary has an example of the masculine adjective

Naïve itself is (in French at least) the feminine form of naïf, which you do occasionally see used in English

Been reading Sax Rohmer novels pretty intensively to prepare for this one. Now I need a bit of a brainwash (not the kind that gets administered in a secret headquarters under Limehouse when the last thing you can remember is an overpowering scent of hawthorn)