Answer:
Lady Macbeth fears that Macbeth is very kind.
Step-by-step explanation:
In "Macbeth" by "William Shakespeare", Lady Macbeth was a selfish lady and was trying to persuade her husband 'Macbeth' to kill Duncan. She knew that he is ambitious and wanted to become the king but feared that he would not take necessary actions to fulfill his ambitions as he was full of human kindness. His compassion might stop him from murdering Duncan. So, Shakespeare writes an expression made by Lady Macbeth about her husband that he "is too full of the milk of human kindness".