vitiate

To reduce the value or quality of; impair or spoil.

To corrupt morally; debase: synonym: corrupt.

To make ineffective (a contract or legal stipulation, for example); invalidate.

To render vicious, faulty, or imperfect; injure the quality or substance of; cause to be defective; impair; spoil; corrupt: as, a vitiated taste.

To cause to fail of effect, either in whole or in part; render invalid or of no effect; destroy the validity or binding force of, as of a legal instrument or a transaction; divest of legal value or authority; invalidate: as, any undue influence exerted on a jury vitiates their verdict; fraud vitiates a contact; a court is vitiated by the presence of unqualified persons sitting as members of it.

Synonyms Pollute, Corrupt, etc. (see taint), debase, deprave.

To make vicious, faulty, or imperfect; to render defective; to injure the substance or qualities of; to impair; to contaminate; to spoil

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.

to spoil, make faulty; to reduce the value, quality, or effectiveness of something

to debase or morally corrupt