Milksop
/ˈmɪlksɑːp/
Definition 1 of 1
Pro Tip 1/3Negative Insult
Used negatively to criticize someone for lack of courage or determination. 
He's such a milksop when it comes to standing up for himself.
Pro Tip 2/3Outdated Usage
Rarely used in modern language and can sound old-fashioned or literary. 
In the old novel, the character was scorned as a milksop.
Pro Tip 3/3Emotional Context
Might imply the person is not only weak but also overly sensitive or emotional. 
Stop being a milksop and dry your tears!