Learner's definition of ROUGHLY
1 : not exactly but close in number, quality, meaning, etc.
Roughly translated, it means “hurry up!”
The new product is modeled roughly on an earlier design.
Roughly [=approximately] 20 percent of our land is farmland.
[more roughly; most roughly]
2 a : in a way that is not gentle or careful b : in a very simple or basic way c : in a way that produces a rough surface