demoralise

1. corrupt morally or by intemperance or sensuality;

"debauch the young people with wine and women"

"Socrates was accused of corrupting young men"

"Do school counselors subvert young children?"

"corrupt the morals"

2. lower someone's spirits; make downhearted;

"These news depressed her"

"The bad state of her child's health demoralizes her"