who are the weak, insensitive characters? explain.

Lennie- mentally weak, he's childlike

Curley- prideful, over compensates for his lack of size by being mean

Candy- physically weak due to the injury of his hand

Curley's wife- no self-esteem

As far as insensitivity, I'd have to say that George can be insensitive to Lennie, but that comes from frustration. Curley is insensitive to his wife's needs and loneliness, thus, she turns it around and looks for attention elsewhere.