# How do I get non-italic words in a theorem environment?

I want some words in my theorem environment to not be italic. I know there are simple ways to get the entire theorem in roman, but I'm looking for an italic theorem with specified words in roman.

I tried:

\documentclass{article}
\usepackage{framed}
\usepackage{amsthm}
\usepackage[svgnames]{xcolor}

\newtheorem{mydef}{Definitie}[section]

\begin{document}
I want \textrm{this} word to be non-italic.
\end{document}


But apparently \textrm is not the way to go because everything is still italic

-

Use the \emph command to emphasize a word. Normally, this will italicize the word, but if you are already in italics mode, it will do the opposite.
I want \textup{this} word to be non-italic.