plana gismu

x1 is plump/fat/obese [excessively thick/bulbous/swollen] by standard x2.

See also cinla, rotsu, barda, punli, grasu.

In notes:

barda
x1 is big/large in property/dimension(s) x2 (ka) as compared with standard/norm x3.
cinla
x1 is thin in direction/dimension x2 by standard x3; [relatively short in smallest dimension].
grasu
x1 is a quantity of/is made of/contains grease/fat/oil from source x2.
punli
x1 is a swelling/protrusion/convexity [shape/form] at/in/on x2, of material x3.
rotsu
x1 is thick in dimension/direction x2 by standard x3; [relatively long in smallest dimension].
tolplana
x1 is thin/skinny/[underweight] [excessively thin/unswollen] by standard x2