Obese
Part of speech: adjective
Definition: Extremely overweight, especially: weighing more than 20% (for men) or 25% (for women) over their ideal weight determined by height and build; or, having a body mass index over 30\mathrm{kg}/\mathrm{m}^2.
Example sentence: Kids who don't play are not just at greater risk of falling behind academically, but also of becoming overweight or obese, failing to integrate socially, and even engaging in criminal activity.
Rotund
Part of speech: adjective
Definition: Having a round or spherical shape; circular; orbicular.Round in body shape; portly or plump; podgyFull and rich; orotund; sonorous; full-toned.