I need to type the word "naïve" in plain text in Latex. Things that I've tried: na\"{\i}ve, na{\"{\i}}ve, na\"\i ve, and other combinations of brackets: i dissappears, and this is what I get:

I tried to switch to math mode and then it works, but I cannot make the \imath to look non-italic, this is what I get from $\mathrm{na\ddot{\imath}ve}$ :

What could possibly be wrong?