WordNet sense 1 (having rugged physical strength; inured to fatigue or hardships):

hardy, stalwart, sturdy

WordNet sense 2 (physically strong):

robust

WordNet sense 3 (firm in purpose or belief; characterized by firmness and determination):

resolute

WordNet sense 4 (euphemisms for `fat'):

portly

WordNet sense 5 (having much flesh (especially fat)):

fat