Yes, Because they all have the same emotions no one is sad and everyone is happy.
-N.C.A
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Yes, the set of happy people is not well defined.
Yes ! If you have a group of sincerely happy people, you'll notice how calm, relaxed, and friendly they are. They would definitely be very well-defined to others !
Big people is a subjective term. This term may mean one thing to someone and another thing to other person. So this set is not well defined.
If there exists even one single item for which you cannot say whether it is in the set or not, the set is not well defined.
A well defined set is one that you know exactly what is meant when you read it. For example, the set of all people 6' 1" tall is well defined. Whenever you meet someone, if they're 6'1" tall, they're in the set. Otherwise, they're not. You know exactly what I mean. So that set is well defined. The set of all cute shoes is not well defined. Jane just adores buckles, so any shoe with a buckle is cute to her. But Martha likes plain shoes. Buckles are big, ugly things that detract from the shoe. So a shoe with a buckle is not cute to Martha. So the set of all cute shoes is not well defined, because you can't just look at it and determine if it belongs in the set. So the set of all buckled shoes would be well defined, but the set of all cute shoes is not.