To corrupt or undermine in morals; to destroy or lessen the effect of moral principles on; to render corrupt or untrustworthy in morals, in discipline, in courage, spirit, etc
de·mor·al·ize demoralizes demoralizing demoralized in BRIT, also use demoralise If something demoralizes someone, it makes them lose so much confidence in what they are doing that they want to give up. Clearly, one of the objectives is to demoralize the enemy troops in any way they can. + demoralized de·mor·al·ized The ship's crew were now exhausted and utterly demoralized. to reduce or destroy someone's courage or confidence
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"