To make vicious, faulty, or imperfect; to render defective; to injure the substance or qualities of; to impair; to contaminate; to spoil; as, exaggeration vitiates a style of writing; sewer gas vitiates the air
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"
If something is vitiated, its effectiveness is spoiled or weakened. Strategic policy during the War was vitiated because of a sharp division between `easterners' and `westerners' But this does not vitiate his scholarship. to make something less effective or spoil it (past participle of vitiare, from vitium; VICE)
To cause to fail of effect, either wholly or in part; to make void; to destroy, as the validity or binding force of an instrument or transaction; to annul; as, any undue influence exerted on a jury vitiates their verdict; fraud vitiates a contract