adverb
naprosto
downright, flatly (for emphasis: naprosto ne znam)
попросту (naprosto ne znam)
In Cyrillic
напросто
Examples from the lessons
Hrana je bila naprosto katastrofalna.
Еда была просто катастрофическая.
Shades of feeling and judgementAppears in immersion pieces
First Menus & Coffeehouses: From China to Paris