discourage

sense 1: try to prevent; show opposition to; "We should discourage this practice among our youth"
deter discourage

sense 2: deprive of courage or hope; take away hope from; cause to feel discouraged
discourage

sense 3: admonish or counsel in terms of someone's behavior; "I warned him not to go too far";"I warn you against false assumptions"; "She warned him to be quiet"
warn discourage admonish monish