fat or rotund
portly - fat
The word ‘portly’ is essentially a more polite and formal way of describing somebody, particularly a man, who is rather fat. It tends to be used more in relation to corpulent middle-aged or older men as opposed to younger ones, who are more likely to be described as ‘stout’ or ‘chubby’.
My accountant is quite a portly gentleman who clearly spends most of his days sitting behind his desk.
Mike is obsessive about his exercise regime because he is determined not to become a portly middle-aged man.
The portly local mayor cut a cumbersome figure as he delivered a speech at the town event.