fat

fat, overweight, obese, chubby, plump, big, well-built 

In general, people do not like to be called fat. But some ways to say 'fat' are less rude than others. 

fat is a very direct word. You might use it about yourself but it will usually cause offence if you use it about someone else • I'm so fat at the moment 

overweight is a more polite way to say that someone is fatter than they usually are or than they should be • She is a little overweight 

obese is a word used especially by doctors to describe people who are very fat, in a way that is bad for their health 

chubby is a more informal word and is used especially of children or of rounded body parts such as cheeks or knees 

plump means fat and rounded in a pleasant way • a plump, motherly womanbig and well-built are fairly polite ways to describe someone with a large, strong, or fat body • For big men like him, air travel can be uncomfortable