"Lack of assertiveness" in Dirtydozenweb3
As I was translating Dirtydozenweb3, I got stuck with this expression "lack of assertiveness."
I know that the expression talks about someone who is not able to say or act in his/her own thoughts.
However, in my point of view, assertiveness has a meaning that is rather negative, and therefore 'lack of assertiveness' seems it has a meaning that is rather positive.
Is it just me puzzled by the combination of the words, or is there a hidden meaning that I dont know of??