adjective
DUBIOUS : His wife is a little bit too fat.
GOOD : His wife is slightly overweight.
DUBIOUS : He's got very fat since we last saw each other.
GOOD : He's put on a lot of weight since we last saw each other.
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In western society being fat is considered to be unattractive. The word fat is common but it is not polite. To say the same thing in a less direct way, use words such as overweight (weighing more than is normal), plump (having a pleasantly rounded shape), chubby (to describe babies and children), stout (short and rather fat), or large / big : 'Large people sometimes have difficulty finding fashionable clothes to fit them.' Another way to avoid fat is to use a phrase such as put on weight or (have) a weight problem: 'He's worried about his weight problem.'