demoralise

v 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" syn corrupt, pervert, subvert, demoralize, debauch, debase, profane, vitiate, deprave, misdirect

2: lower someone's spirits; make downhearted; "These news depressed her"; "The bad state of her child's health demoralizes her" syn depress, deject, cast down, get down, dismay, dispirit, demoralize ant elate

Source: WordNet. Princeton University

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