As you would expect, very negatively.

There are many variables that may affect a child that is neglected - severity of neglect, personality of the child (how resilient they are), if child experiences physical, sexual abuse, involvement of drugs/alcohol, is the child malnourished, intellectual functioning of the child, sleep patterns, is the child also abused in school by being bullied, etc.
All those variables will play a part on how the child will respond but in general will affect their ability to develop in a healthy way, grades, health, and behaviors.

We are taught by them almost every action and thinking habit. Television and films do this also. So it all affects us.

This link will help answer your question:

https://www.verywellmind.com/what-is-uninvolved-parenting-2794958