Rotund is a very polite way of saying someone is fat.

2 hours ago, Bill W said:

As long as you don't refer to me as rotund.  

So you would prefer...

23 minutes ago, Bill W said:

Slightly overweight, thank you. 

My mother simply described herself as a big person. It was ambiguous, and in her case could be interpreted in different ways.

2 hours ago, JamesSavik said:

Rotund is a less rude word for fat. I got tired of being fat and lost eighty pounds (36.6 kg)... about the weight of a middle schooler.

No, I didn't eat a middle schooler, but there were times I was so hungry, if one had been slow, things might have gotten dicey.

Middleschooler ? Rotund ones, I presume.