The word «ПРОСТО» has several meanings in the Russian language. 1. easy For example, Учить русский язык не так-то ПРОСТО. - Learn Russian is not so EASY. Управлять автомобилем ПРОСТО. - Driving is EASY (not difficult). 2. modestly For example, Она одета ПРОСТО. - She dressed MODESTLY, not rich 3. just For example, Я не хотел делать это. ПРОСТО у меня не было выбора. - I did not want to do it. I JUST have no choice. Additionally, the word "ПРОСТО" is a filler word in Russian.

Просто - simply, just

I hear many time this word in russian conversation ========== In that meaning: "Just". E.g. Не обращай на него внимания, он просто мудак. Do not mind him, he's just an asshole.

просто = merely