mentäväksi
I’m not finding a reliable, widely recognized meaning for “mentäväksi” in standard Finnish or other languages. Because of that, I can’t confidently produce a wiki-style article without more context or a source. It might be a form built from Finnish verb stems with the participle suffix -vä- and the translative -ksi, but that would be speculative without a dictionary or usage example.
If you can share the context (for example, the field where you saw the term, a source,