‘Tis sweet and commendable in your nature, Hamlet,
To give these mourning duties to your father:
…but to persever
In obstinate condolement is a course
Of impious stubbornness; ’tis unmanly grief;
It shows a will most incorrect to heaven,
A heart unfortified, a mind impatient,
An understanding simple and unschool’d.

– William Shakespeare

Hamlet, Act 1, Scene 2. Claudius mockingly labels Hamlet’s excessive grief for his father as “unmanly.” It goes against God’s wishes and demonstrates a soft heart and uneducated mind, he tells the prince.