A2
Something that is thin is smaller than usual between its opposite sides.
Dictionary examples:
My cat thinks she's thin, but her mirror disagrees. (0.0)
His glasses were so thin, they looked like contact lenses. (0.0)
The pizza was so thin, it disappeared when turned sideways. (0.0)
The walls are very thin. (7.7)
a thin jacket (8.3)
a thin slice of meat (26.1)