B1
level and smooth, with no high, raised, or round parts
Dictionary examples:
My pancake was so flat, I used it as a frisbee! (0.0)
My drawing of mountains was so flat, it looked like a straight line! (0.0)
The Earth isn't flat, but my jokes are! (0.0)
Much of the countryside in East Anglia is very flat. (25.7)
An ice rink needs to be completely flat. (53.5)
Roll out the pastry on a flat surface. (72.2)